'04 Cat Converter

Remove the cat today, exhaust sounds a little deeper after the removal. Used a big screwdriver and hammer to remove.

Cat before

Cat after

nice. how long did it take? and more importantly, how was the post-removal test ride?

After the exhaust pipe was removed it took about 10 minutes to get the converter out. Can't ride yet, started snowing this afternoon. Originally posted by bluesurf nice. how long did it take? and more importantly, how was the post-removal test ride?

you have stock cans or an aftermarket slip on?

I'm going to have my bike dynoed next week. I'm planning on removing my cat also. I''ll have it dynoed again after to see the actual gain if there is any. I'm wondering how long the job took also?:dunno

Stock, see my post on the bracket removal Originally posted by Rooster62181 you have stock cans or an aftermarket slip on?

I hope you have done a dyno before and after and are able to show us that you did gain nothing....

Originally posted by Juerg I hope you have done a dyno before and after and are able to show us that you did gain nothing.... Uuuh.... and you are saying what?:dunno

You need to change the mapping after removing the cat. Otherwise the engine will run lean. Not really good for it, especially during break-in.

Stock jetting is usually a little rich on the top end and a little lean in the low/mids. Gutting the cat shouldn't screw up the mapping as far as top end hp. He should actually see a small gain in top end hp. It's kind of like installing a better flowing can on any other bike. You will get a small gain and you don't have to remap with a PC3 but you might get a little more gain with a very mild midrange remap. There is no chance of hurting anything by gutting the cat. I am curious to hear if the midrange and light/cruise throttle feels lean at all....... any light surging? I doubt just gutting the cat would cause this but gutting the cat AND install aftermarket cans together might lean out the mids enough to feel it. Thanks for the pics, those are great! Without having to search through additional posts, can you tell us if you're still running the stock cans? In looking at your pics, it appears that the cat was only about 1 1/2" thick. Is that correct?

Originally posted by Juerg I hope you have done a dyno before and after and are able to show us that you did gain nothing.... Why would you think that removing a brick in the middle of your exhaust system would not result in any hp gains? Gutting the cat should produce similar gains to installing a more free flowing can. Yamaha themselves already admitted the cat killed off 2hp. Maybe over in Switzerland you guys don't have a lot of experience with catalytic converters. Over here in the USA, we've had them since approx. 1975. I've personally removed/gutted at least 50 cats on carbueted and fuel injected cars over the years. Each and every single one gained hp and went faster in the 1/4 mile in both E.T. and mph. As far as exhaust flow in concerned, gutting the cat is no different than installing a more free flowing can. Same results, same jetting requirement, will not hurt your bike.

Amen! It will lean it out just a little. Now, if you were to do that mod with new exhaust cans and a free flowing air filter you would be running way lean.

Nice job........................:hellobye

Seems like this mod will help many people out as they don't care to change out their OEM systems therefore cutting down on cost as well. Perhaps using the YEC slip-ons along with this mod may be the ticket for someone.:sneaky BD

I installed a PCIII usb on the bike at the same time so I'm not too concerned with the lean condition. The cat is about 2-2.5" inches long in the pipe.

Hurry up and get it dynoed, lets see if the dip at 7k is cured, if so, then the damn kitty did it!!LOL

Originally posted by GRH I installed a PCIII usb on the bike at the same time so I'm not too concerned with the lean condition. The cat is about 2-2.5" inches long in the pipe. What map did you use?

Hang the pussy..................cat.:sneaky BD

Why would you think that removing a brick in the middle of your exhaust system would not result in any hp gains? Surelly nothing worth the 10000 times pollution afterwards! But some people seem just not be able to learn that pollution is not just a problem of science fiction. (I am talking about street use). Do you really think the engineers are so dumb that they are not able to design the cat propperly so it does not cost significant power? Yamaha is talking about a loss of 2hp, that's what I expect to see. (Test: Custom map a stock R1, measure it, remove cat, remat, measure and then compare). Ever wondered why the tube is thicker where the cat is? Could it be that this is just to compensate for the added back-pressure????

Each and every single one gained hp and went faster in the 1/4 mile in both E.T. and mph And it was just the cat, yes? You didn't change anything else like the mapping for example? And you could not have gained this power with the cat in place, no? What do you think what next generations might judge to be more relevant, a destroyed environment or a gain of 0.1" in a 1/4 mi run? If you have a bike that is just used for drag racing, I don't mind, it won't make significant miles and will not contribute to pollution. But this is not what we are talking about here. We may have had the cat later on the road over here but at least we have understood what it is for. You know, if somebody brought in valid data, showing that the cat costs significant power, then I would at least understand why people hollow out the cat, but just doing it without knowing anything is beyond what I can understand. (Valid would mean: Take stock R1, make custom map, dyno it, remove cat but don't change anything else, remap, test again).

Perhaps, in the US, we feel that the number of motorcycles operating without cats will not make a significant difference. Besides, Jureg, it is not possible to buy a full system that does not eliminate the cat. So, if you have lots of money and buy a full system its OK; but, if you are strapped for cash you shouldn't remove the cat? RE the need to remap after removing the cat. There was an earlier post from an authoritative source (someone in the business if I remember correctly) stating that REMAPPING IS REQUIRED which essentially means that the bike will have significantly less backpressure and will produce more power. Sorry, I don't remember where it was posted. Possibly with the Akra specs for the cat removal slip-on option?

So, if you have lots of money and buy a full system its OK I don't remember having said that. But at least, installing a full system, one will have good reason to expect a serious hp gain. My point is mainly that removing the cat without even knowing if it hurts is silly! I didn't say that remapping is required, but if one removes the cat, remaps then and sees some hp gain it is more likely that this is from remapping than from removing the cat. Getting a real idea what the cat's influence is requires custom maps before and after. That's the only way to elliminate other influences.

Agreed, but if it is true that remapping is required than that would constitute de-facto proof that it will produce more power without the cat, i.e. if you are burning more fuel - you are producing more power! I understand your arguement re the engineers designing the cat properly, etc. But, they have to work within various constraints. One of them being space. Certainly, an engineer can design a cat that would not increase backpressure, but it would probably be too large and too expensive. Also, the large size would probably also screw up the timing and force of the backwave pulse. From all of the information that we have so far, it seems to me that someone could have a really good exhaust system by just replacing the section of pipe from the cans to the headers. Thereby eliminating the cat and the exup valve. Perhaps comeone will sell a semi-full system that replaces everything up to the stock headers.

if you are trying get an environmental message out, I think you are preaching to the wrong choir. I undersatnd your point, but i mean come on, what do you expect us to do, not mod our bikes because you are worried it will hurt the environment. people are going to do what they are going to do.

Originally posted by Juerg Yamaha is talking about a loss of 2hp, that's what I expect to see. 2hp for 15 minutes of my time and no $$$!! Seems like a no brainer to me. :D I just finished gutting mine an hour ago.

If people want to remove the cat conv, I have no problem with them at all. The contribution these bikes make to air pollution is absolutely negligible. With or without catalytic converters. :fact

Originally posted by Eyespy If people want to remove the cat conv, I have no problem with them at all. The contribution these bikes make to air pollution is absolutely negligible. With or without catalytic converters. :fact :iamwithst

OMFG, its pretty funny to see people arguing over a motorcycles pollution with or without the cat. LOL, you think that our little motorcycle will kill the earth for our next generation of riders?? Get real! I'd say at least 100% more pollution comes from your everyday V-8. And people drive them more times a year than motorcycles! Dont argue over the insignifigent pollution a bike does, go whine to the guys over at hummer or any deseal truck manufaturer.

Originally posted by ImagineParadise OMFG, its pretty funny to see people arguing over a motorcycles pollution with or without the cat. LOL, you think that our little motorcycle will kill the earth for our next generation of riders?? Get real! I'd say at least 100% more pollution comes from your everyday V-8. And people drive them more times a year than motorcycles! Dont argue over the insignifigent pollution a bike does, go whine to the guys over at hummer or any deseal truck manufaturer. It wouldn't matter if bikes made one hundred times the particulate and HC emmisions of cars/SUVs. Their contribution to air polution would still be negligible.

agree!

Back to the main subject. Cant wait to see pre and post dynojet numbers! Someone needs to do a nice web page with instructions on this too. Hide

What I am partly worried about is the quality of sound. I once gutted the cat on my race car and it changed from nice and throaty to sounding like a thousand wasps were flying around in a coffee can. The cat on a car usually has a much larger chamber than the rest of the pipe. The air flowing nicely in the pipe then becomes turbulent as it enters the hollow cat chamber and made that god awful ricer car on crack noise. If the cat on the R1 didn't have a larger chamber, I wouldn't be worried.

Originally posted by Landshark92 What I am partly worried about is the quality of sound. I once gutted the cat on my race car and it changed from nice and throaty to sounding like a thousand wasps were flying around in a coffee can. The cat on a car usually has a much larger chamber than the rest of the pipe. The air flowing nicely in the pipe then becomes turbulent as it enters the hollow cat chamber and made that god awful ricer car on crack noise. If the cat on the R1 didn't have a larger chamber, I wouldn't be worried. the sound coming from an inline 4 on a bike vs what ever "race car" you have isn't even in the same country as far as compairisons go. Question, what kind of "race car" did you have? :lol "race car" shouldn't you say something like my '94 supra or something respectful like that instead of "race car":bash :bash :bash :lol I cant stop laughing..."my race car"

IP, I asked a ? I didn't make a statement that that was what was going to happen, asserting my knowledge. Can't I ask a stupid ? without getting flamed for it? I raced a Spec Miata BTW, 1.6 liters, 116HP, inline 4. Just figured that on a motorcycle board, I'd temper my enthusiasm for cars.

Originally posted by Landshark92 IP, I asked a ? I didn't make a statement that that was what was going to happen, asserting my knowledge. Can't I ask a stupid ? without getting flamed for it? I raced a Spec Miata BTW, 1.6 liters, 116HP, inline 4. Just figured that on a motorcycle board, I'd temper my enthusiasm for cars. Dude, first of all, chill the fvck out. Blow all that sand out of your vagina. If you cant handle comments like that go join a girls forum. All I was saying is that you shoulda said what kind of car you had (which you did in this puffed up reply). If your going to get all puffed up because I thought what you said was funny count to 10 real slow, remind yourself your a guy and forget about it. Hell, laugh with me while your at it. Geez calm the fvck down!!!!!!!

Now that I've counted to ten, what you did was basically took my original question and dismissed it as apples to oranges. You gut the cat on your bike, I gut the cat on my "race car". There is a comparison in there somewhere. Then after reading my whole post, you get hung up on the word racecar. That wasn't my intention but I am glad you had a laugh. Lastly, I know a lot of people with Supras. I only know a few with actual race cars. So calling it a race car is more respectable than if I were to tell you I had some loud, underpowered Miata. And you'll understand me better when people laugh when your serious, and serious when your joking.

And the real reason I carefully chose the word race car in my original post was that I wanted to distinguish it from a street car. I don't think you should gut the cat on a street car, so sorry for the misunderstanding. So now whaddaya think about the cat huh, any more flaming goin on? Just kidding, dude

LOL, you think that our little motorcycle will kill the earth for our next generation of riders?? Go read again! My point was two things: - it is stupid and irresponsible to remove the cat without evidence that it really costs considerable performance. Nobody here actually knows if it does make sense. It may very well have just the oposite effect because there may exist all sorts of turbulences in this empty cat housing afterwards. - if the gain is just 2hp I suggest to leave the cat where it is and to spend some energy in better drivers skills instead. This, for 95% here, will have better results on the track.

I won't be quarrelling over a gain or no gain of 2 hps, when it means I still have 172+8 hp to play with on the street. But, if you want to fiddle and modify, that's your choice and have fun abd enjoy yourself. Now back to the pre and after dyno runs guys...let's see it...!!! Cheers, Warp

GREAT JOB GRH!!!:thumbup :finger BYE BYE my kattt...:finger :finger

Very good job on the mod,I shall try this on my Bros bike tonight....Thanks

Originally posted by Landshark92 What I am partly worried about is the quality of sound. I once gutted the cat on my race car and it changed from nice and throaty to sounding like a thousand wasps were flying around in a coffee can. The cat on a car usually has a much larger chamber than the rest of the pipe. The air flowing nicely in the pipe then becomes turbulent as it enters the hollow cat chamber and made that god awful ricer car on crack noise. If the cat on the R1 didn't have a larger chamber, I wouldn't be worried. Good question. I once gutted my auto catalytic converter as well. It made it sound more raspy (I did not like it). I can tell you that after removing the catalytic converter on my '04 R1, the sound is still great! The catalytic converter on the R1 is actually rather big in comaprison to the mid pipe. Its almost 2" in dia. and approx. three inches long. The webbing is rather intricate and full.

Heh sounds like we got a Cat fight there...well anywayz, a 110+ HP miata is as about as much of a race car is my Countor... Hide

Originally posted by Landshark92 Now that I've counted to ten, what you did was basically took my original question and dismissed it as apples to oranges. You gut the cat on your bike, I gut the cat on my "race car". There is a comparison in there somewhere. Then after reading my whole post, you get hung up on the word racecar. That wasn't my intention but I am glad you had a laugh. Lastly, I know a lot of people with Supras. I only know a few with actual race cars. So calling it a race car is more respectable than if I were to tell you I had some loud, underpowered Miata. And you'll understand me better when people laugh when your serious, and serious when your joking. So what if I got caught up on the word race car huh? What if I saw the noticable difference in your question? Is that a reason to get all bitchy? Maybe if you were a girl. Thats all I did and you blew it way out of proportion. LOL and you're calling a Supra a underpowered miata? Im not even going to argue about. I hate ricers period. Oyea, and "I know a lot of people with supras too" and they aint no underpowered miata. Wheres that vid that showed a Supra hang with a busa on a roll on? It was only for about 2 or 3 seconds but that aint no "underpowered miata". Once again, I urge you to chill out. yo, about the serious when joking and joking when serious...I dont have a problem with that because I take everything as it comes to me. Laid back, some would say. Now, if we were talking about a heart attack or an accedent its no time to be joking but thats ritorical. so lighten up!!!

Damn IP, I think your the one getting all hot and bothered now. I had pretty much dropped it even tho you keep questioning my gender. And what is all this nonsense about Supras and Miata's. You said that I should call my Miata "race car" something respectful or respectible. I said that calling it a race car is much cooler than calling it a loud, underpowered Miata, which it is both things. Even though I loved driving that thing immensely, I took a pot shot at it, so I am not afraid to poke a little fun at myself or lighten up as you would like to put it. And Hideout, my Miata would smoke your Contour around a track just cause your all-seasons would overheat in a couple laps. Thanks R1-Superstar, I am going to gut the thing. You think it arguably sounds better now, right?

oooooooooops, my bad, I thought you were calling supras "underpowered miatas" LOL and i am NOT questioning your gender bud, I was just kidding. :lolLOL "race car" LOL:lol

Congratulations IP, our little spat has turned into a sticky for all to see, LOL.:lol

Nooooo, seriously?

:lol :rock

Originally posted by Landshark92 Thanks R1-Superstar, I am going to gut the thing. You think it arguably sounds better now, right? Yes! :thumbup Really makes me second guess a set of slip-ons.

To those guys who havee removd their cats. Has it reduced the heat in the seat area? Some people have noticed that the bike gets a little hot around the right thigh and seat. I've figured that the cat might have something to do with that, since cats get very hot and it is in that general area. So, any improvement in the heat issue by removing the cat?

YAMAHA YZF R1 (2004) AKRAPOVIC SLIP-ON EXHAUST SYSTEM For the 2004 Yamaha R1 we present a basic version of the Akrapovic SLIP-ON exhaust system with two mufflers and two link pipes. We have also developed an extended version with an optional Y- connecting tube. The basic Akrapovic SLIP-ON system allows the use of the stock catalytic converter. The version with the optional Y- connecting tube extends past the point where the catalytic converter is located, so that the catalytic converter is removed. There is no major difference in performance between the two systems. However, they both outperform the stock system in both power and torque. The system is intended for riders who do not wish to make major exhaust system modifications. PERFORMANCE Measurements of the Akrapovic SLIP-ON system on the YAMAHA YZF R1 (without optional Y-connecting tube): Power: performance measurements were made on both systems. The difference is minimal, with the advantage going to the option with the optional Y-connecting tube, which is slightly better in the middle of the rpm range. There is also a slight difference at the top end, but this does not affect the riding characteristics. Despite being only a first-stage tuning component, the system adds quite a bit of power to the stock engine figures. The standard option without the Y-connecting tube puts out 159.6 HP at 12800 rpm. The option with the optional Y-connecting tube was measured at 159.4 HP at 12700 rpm. Torque: the torque curves of the two options are also very similar. There is a significant increase over the stock torque curve, especially above 6000 rpm.

All you bastards in the States gutting your cats just caused the earth's temperature to rise 0.0000000000000000000000003 degrees centigrade

i heard the 04 runs cooler with the cat removed,is this true?

Originally posted by red 04 i heard the 04 runs cooler with the cat removed,is this true? Just a little, not much difference.

Originally posted by r1-superstar Just a little, not much difference. SO the 'cat on a hot tin roof' has been replaced by 'a cat in a hot pipe'.;) BD

Originally posted by Big Daddy SO the 'cat on a hot tin roof' has been replaced by 'a cat in a hot pipe'.;) BD Who also happens to be the "cat in the hat's " inbred sister.:cryin :lol

Is it a bitch to remove the pipes inoder to get the cat off??? I think I will do mine tonite.....:D

Originally posted by HornyRabbit Is it a bitch to remove the pipes inoder to get the cat off??? I think I will do mine tonite.....:D The whole process is simple and took about one and a half hours.

Originally posted by r1-superstar The whole process is simple and took about one and a half hours. You bastid! I'm calling the animal rights activist :scared BD

:corn :corn :corn

You bastid! I'm calling the animal rights activist :D :D :D

OK, I've read through this entire post and others as well, and nobody has the simple answer that I can find. I'm willing to spend 1-2 hours removing the d--- thing if its worth it. And the main thing I care about is the heat. Secondary is the hp gain. I don't expect much, but it would be nice to know. About ever 15 posts someone asks this question in some way. But so far the only reasonable facsimile of an answer came from Greg Crowe based on auto experience and later another post that said the heat reduction was negligible. If the hp gain and heat reduction are negligible I think I'll just leave it on the bike, since Dynojet doesn't have a map for Stock w/o Cat. Heck, I'm not even sure what I just said any more. Does anyone have some real life feedback on this. It sure seems like a lot of you guys have removed it. BTW, I haven't got my 04 yet. Supposedly the last week of this month some redneck trucker is going to find his way up I-91 to New Haven, if he doesn't stop for an extra Lot Lizard down south somewhere. And yes, I am holding my breath. Why oh Why did I move to the East Coast? I've never had to wait this long for a new bike. And on top of everything else it snowed this week. OK, Whine-mode over. But I would like to have an experienced answer on the Cat question. Cheers,

Originally posted by Vigor_Mortis To those guys who havee removd their cats. Has it reduced the heat in the seat area? Some people have noticed that the bike gets a little hot around the right thigh and seat. I've figured that the cat might have something to do with that, since cats get very hot and it is in that general area. So, any improvement in the heat issue by removing the cat? On my bike it made a big difference on the the motor heating up. Here it has been about 83 degrees though. It used to heat up very quickly at stopllights and now it's much better. More like my 00' R1

Thanks R1LOVER. I was hoping to hear that the cat was the source of the seat heat. I've read reviews in which riders have really complained about that heat in the area of the cat. I know that the underseat design will put more heat near the rider, but what I was hearing sounded more nasty than just the pipe location. So I have been assuming that the cat has something to do with it. Sounds like as easy fix, though. And the effect on the environment from removing this cat is negligible. How many R1s are going to be made? Of them, how many will have changes made to the exhaust? On average how often will they be ridden? After considering all of those, the combined pollution of every '04 R1 without a cat is probably putting out less pollution per month, than a single big diesel semi-truck or a couple of city buses.

an Expedition puts out .15 grams of hydrocarbons per mile. A durango puts out .073 grams/mile. How much does an R6 put out? 4.19 grams/mile!! that means your R1 is polluting somewhere around 28X as much pollution as one of our largest SUVs, 50X as much as the Durango. The CAT is designed as a starting point to close this staggering gap. If you want to knock it out just to make 2 more HP on the top, thats you're preogative. Its probably what the rest of the world would expect Americans to do anyway. But don't try and justify such selfish behavior with thinly veiled fallacies like "its negligible impact, doesnt pollute as much as this or that".

This last post is the kind of manipulation of numbers that sticks in my craw. I happen to work as an environmental scientist, and I have done so for the last 14 years, so I have a little more insight into this than most. It doesn't matter if the motorcycle is emitting 1000X more hydrocarbons than those LEV cars. Nothing times nothing is still nothing, and the numbers that you list are still NOTHING. It's about like a drop-of-sand-in-the-ocean-kind-of -nothing.:hellobye

Originally posted by mercurial an Expedition puts out .15 grams of hydrocarbons per mile. A durango puts out .073 grams/mile. How much does an R6 put out? 4.19 grams/mile!! that means your R1 is polluting somewhere around 28X as much pollution as one of our largest SUVs, 50X as much as the Durango. The CAT is designed as a starting point to close this staggering gap. If you want to knock it out just to make 2 more HP on the top, thats you're preogative. Its probably what the rest of the world would expect Americans to do anyway. But don't try and justify such selfish behavior with thinly veiled fallacies like "its negligible impact, doesnt pollute as much as this or that". Another meaningful post.........:sleep

Anyone get any numbers yet for removing the CATS. BTW... Imagine Paradise... This pics for you...

VPREATR has results, it was zero, if I understood that right. But maybe you get him to post his dynos, what would end all speculatios...

One of the benefits may or may not be hp gain, I haven't seen any numbers yet. The big benefit as I've heard it here is the heat reduction. And several have posted that it reduced the heat noticeably from the "seat of the pants" perspective. Talk about global warming!

Originally posted by LeeAMARacer One of the benefits may or may not be hp gain, I haven't seen any numbers yet. The big benefit as I've heard it here is the heat reduction. And several have posted that it reduced the heat noticeably from the "seat of the pants" perspective. Talk about global warming! :iamwithst This was the only reason I removed mine, 1 or 2 hp +/- is negligible.

I just removed mine. - Results.... Not much... Doesn't sound as tight as factory. Would I do it again.... Prob not. New exhaust...Yeah, its time now.

Hey, Blue thanx for the honest feesback :hellobye

No prob Kneedy... Actually GRH... You did a great job writing this thread up... Any one interested in doing this mod.... MAKE SURE before you take your bike all apart.. THAT YOU HAVE THE RIGHT TOOLS TO DO THE JOB... I couldn't find my long screwdriver or my long drill bit with the wire bristles. Heres what I used and how I did it. When taking the tail off. The top of the tail has two screws near the battery and one Torx bolt at the rear of the rear seat. Then there are two plastic slide bolts under the mid tail. Take them completely out. CAREFULLY SLIDE THE TOP OF THE TAIL BACK 1". There are little tabs that hold the top and bottom together. Do not force the tail off. Take the L & R Black exhaust covers off that hold the exhaust hangers. Then take off all of the Exhaust hanger bolts. Loosen the Clamps on the Exhaust ends and one below the Y Cat. I unfastened the right Rearset when I took the exhaust heat cover off. JUST WATCH OUT THAT WHILE IT IS DANGLING THERE IT DOESN'T SCRATCH ANYTHING. Remove the Exhaust pipe and then remove the Y CAT. I used a 7/8's drill bit. Drilled 7 or 8 holes in the honeycomb. It is probabaly 4 inches deep. This gives you room to work. I have a 2" Pipe that is about 2 feet long with a chisel on the end. Put the pipe end on the ground and carefully work the honeycomb out. Should take 15 minutes to get everything cleaned out. I was really suprised how light the factory exhaust pipes are. Originally posted by KNEEDY R1 Hey, Blue thanx for the honest feesback :hellobye

Thanks Blue for the writeup. What do you mean by not as tight as factory? And do you have a PC installed,... if not would that cure the issue? Thanks,

No PCM installed. Actually just put on another 200 miles on and seems to be running fine. The bike sure likes to turn....

Originally posted by LeeAMARacer Thanks Blue for the writeup. What do you mean by not as tight as factory? And do you have a PC installed,... if not would that cure the issue? Thanks, It sounds better than stock, and feels GREAT!

****************It sounds better than stock, and feels GREAT! Sooo good. Except for a concern over pollution, I haven't read a single post that has anything bad to say about removing the cc.

Superstar... You think theres a big sound diff? What sounds cool as hell is when I got everything off and I lit the bike up without any exhaust on... Now that sounded cool. My neighbors didn't like the sound though... I got a lot of mean looks...

Originally posted by cranky1 This last post is the kind of manipulation of numbers that sticks in my craw. I happen to work as an environmental scientist, and I have done so for the last 14 years, so I have a little more insight into this than most. It doesn't matter if the motorcycle is emitting 1000X more hydrocarbons than those LEV cars. Nothing times nothing is still nothing, and the numbers that you list are still NOTHING. It's about like a drop-of-sand-in-the-ocean-kind-of -nothing.:hellobye Cranky, If those numbers are wrong somehow I would love for you to tell me how. They come right from an EPA press release. I'm not a scientist so I have no way of verifying how correct they may or may not be. Nothing times nothing, why don't you clarify that. Do you mean its because sportbikes represent such a small segment of the driving population? You could also argue that taking all the CATs out of your SUV is a "drop-in-the-sand-kind-of-nothing" because you are only 1 SUV out of millions and your one vehicle's impact on the environment is negligible. Does this somehow make it alright? Your arguement is based on a readily obvious fallacy in logic. Almost every ethical theory out ther e will soundly affirm this.

Originally posted by r1-superstar Another meaningful post.........:sleep This is coming from a guy who practically sets the record for moronic posts. Honestly r1-superstar, you probably one of the least intelligent people I've seen on this forum. If it smooths out the power curve, adds a bunch more torque/HP, then great I'm all for it. You retards haven't even see a dyno graph for what this mod even does, and yet you're all knocking it out. At this juncture all we really know is that you're making your bike into an even grosser polluting vehicle than it already is. It makes no sense at all.

are you guys seriously still talking about this? give it rest.

Originally posted by mercurial This is coming from a guy who practically sets the record for moronic posts. Honestly r1-superstar, you probably one of the least intelligent people I've seen on this forum. If it smooths out the power curve, adds a bunch more torque/HP, then great I'm all for it. You retards haven't even see a dyno graph for what this mod even does, and yet you're all knocking it out. At this juncture all we really know is that you're making your bike into an even grosser polluting vehicle than it already is. It makes no sense at all. Yep, That's me! Mr. Ignorant.:finger Thanks for noticing.........:2bitchsla P.S. You should find out the truth before opening your "Pie Hole.":fact BTW, here is a list of the Motorcycles the "moronic, least intelligent retarded person" has owned. Not bragging (not my intention at all), just setting you straight. Streetbikes: 1971 HD XLCH Sportster 1000 1985 GS 700 E 1987 CBR 600F Hurricane 1988 GSXR 1100 1989 GSXR 1100 1990 CBR 600F Hurricane 1990 GSXR 750 1990 CBR 600 F2 @ 2 1990 HD FXR Low Rider 1991 ZX6 @ 2 1991 VFR 750 1991 Katana 600 1992 CBR 600 F2 @ 3 1992 ZX7-RR 1993 ZX7 @ 2 1993 ZX9-R 1993 CBR 600 F3 1995 ZX6-R 1995 YZF 600 1995 ZX9-R 1996 ZX7-R 1997 ZX6-R 1997 ZX9-R 1998 ZX6-R 1998 CBR 600 F3 1998 Ducati 900 SS 1998 YZF-R1 1999 ZX7-R @ 2 1999 ZX9-R 1999 YZF-R1 2000 ZX6-R 2000 ZX7-R 2000 ZX9-R 2000 YZF-R1 2001 YFZ-R6 2002 YZF-R1 2004 YZF-R1 (Current) Dirt Bikes: 1970 something Honda 100 1985 Honda XR 250 1987 YZ 125 1990 KX 125 1994 KX 125 1996 KX 250 2002 WR 426F (Current)

Originally posted by BLU99VETTE Superstar... You think theres a big sound diff? What sounds cool as hell is when I got everything off and I lit the bike up without any exhaust on... Now that sounded cool. My neighbors didn't like the sound though... I got a lot of mean looks... It sounds pretty good. Good enough that I won't be purchasing an aftermarket exhaust slip-on or full. But this is my choice and opinion.

Originally posted by r1-superstar Yep, That's me! Mr. Ignorant.:finger Thanks for noticing.........:2bitchsla P.S. You should find out the truth before opening your "Pie Hole.":fact BTW, here is a list of the Motorcycles the "moronic, least intelligent retarded person" has owned. Not bragging (not my intention at all), just setting you straight. Streetbikes: 1971 HD XLCH Sportster 1000 1985 GS 700 E 1987 CBR 600F Hurricane 1988 GSXR 1100 1989 GSXR 1100 1990 CBR 600F Hurricane 1990 GSXR 750 1990 CBR 600 F2 @ 2 1990 HD FXR Low Rider 1991 ZX6 @ 2 1991 VFR 750 1991 Katana 600 1992 CBR 600 F2 @ 3 1992 ZX7-RR 1993 ZX7 @ 2 1993 ZX9-R 1993 CBR 600 F3 1995 ZX6-R 1995 YZF 600 1995 ZX9-R 1996 ZX7-R 1997 ZX6-R 1997 ZX9-R 1998 ZX6-R 1998 CBR 600 F3 1998 Ducati 900 SS 1998 YZF-R1 1999 ZX7-R @ 2 1999 ZX9-R 1999 YZF-R1 2000 ZX6-R 2000 ZX7-R 2000 ZX9-R 2000 YZF-R1 2001 YFZ-R6 2002 YZF-R1 2004 YZF-R1 (Current) Dirt Bikes: 1970 something Honda 100 1985 Honda XR 250 1987 YZ 125 1990 KX 125 1994 KX 125 1996 KX 250 2002 WR 426F (Current) whats your point? that you total alot of bikes? That you're some rich A.D.D schmuck that is never happy with what he has? I mean seriously, you've owned a 99,2000,2002 and a 2004 r1, thats practically one for every year they made one, so its either one or the other. maybe you're trying to show me how experienced you are? It doesn't sound like any wisdom rubbed off during that experience judging on what comes out of your "pie hole".

whats your point? that you total alot of bikes? That you're some rich A.D.D schmuck that is never happy with what he has? I mean seriously, you've owned a 99,2000,2002 and a 2004 r1, thats practically one for every year they made one, so its either one or the other. "putting me in my place" by listing all the bikes you've owned... how pathetic.

Originally posted by mercurial whats your point? that you total alot of bikes? That you're some rich A.D.D schmuck that is never happy with what he has? I mean seriously, you've owned a 99,2000,2002 and a 2004 r1, thats practically one for every year they made one, so its either one or the other. "putting me in my place" by listing all the bikes you've owned... how pathetic. :riding :) :riding You don't even know me, or what I know, or how much I know. So stop being an ASS!!:fact

I'd like a 3rd party opinion here...

Lee, just fgo back a few pages... there are other opinions.

But only a few worth mentioning.;) BD

OK DUMBELLS HERES THE STORY AKROPOVIK EXHAUST FOUND A .2 HP GAIN AT AROUND 8400 RPM WITHOUT THE CAT . and sound db went up 3.9 desibles which is cool butttttttttttttt they have a special y connecting pip which is narrow and same as the connecting pipes where as stock you have that widining of the pipe where is meant for cat withoutthat cat in that wide pipe you have no even exhaust pressure. so to getthe effect you hav eto install y connecting pipe !!!

Originally posted by bmw528i OK DUMBELLS HERES THE STORY AKROPOVIK EXHAUST FOUND A .2 HP GAIN AT AROUND 8400 RPM WITHOUT THE CAT . and sound db went up 3.9 desibles which is cool butttttttttttttt they have a special y connecting pip which is narrow and same as the connecting pipes where as stock you have that widining of the pipe where is meant for cat withoutthat cat in that wide pipe you have no even exhaust pressure. so to getthe effect you hav eto install y connecting pipe !!! Did you ever stop and think that maybe some of us removed the Cat for heat reasons not necessarily power gains.

Originally posted by BLU99VETTE No prob Kneedy... Actually GRH... You did a great job writing this thread up... Any one interested in doing this mod.... MAKE SURE before you take your bike all apart.. THAT YOU HAVE THE RIGHT TOOLS TO DO THE JOB... I couldn't find my long screwdriver or my long drill bit with the wire bristles. Heres what I used and how I did it. When taking the tail off. The top of the tail has two screws near the battery and one Torx bolt at the rear of the rear seat. Then there are two plastic slide bolts under the mid tail. Take them completely out. CAREFULLY SLIDE THE TOP OF THE TAIL BACK 1". There are little tabs that hold the top and bottom together. Do not force the tail off. Take the L & R Black exhaust covers off that hold the exhaust hangers. Then take off all of the Exhaust hanger bolts. Loosen the Clamps on the Exhaust ends and one below the Y Cat. I unfastened the right Rearset when I took the exhaust heat cover off. JUST WATCH OUT THAT WHILE IT IS DANGLING THERE IT DOESN'T SCRATCH ANYTHING. Remove the Exhaust pipe and then remove the Y CAT. I used a 7/8's drill bit. Drilled 7 or 8 holes in the honeycomb. It is probabaly 4 inches deep. This gives you room to work. I have a 2" Pipe that is about 2 feet long with a chisel on the end. Put the pipe end on the ground and carefully work the honeycomb out. Should take 15 minutes to get everything cleaned out. I was really suprised how light the factory exhaust pipes are. It's obvious from your post that removing the cat means destroying it so you can't bolt it back on. I'm thinking what happens if you have a warranty claim which involves stripping the bike and they find the cat gone!Dealers can sometimes be really 'awkward' about warranty work if they find it's been 'modified'.Just another thought to chew on.

GRH YOU TOLD US HOW YOU DID IT NOW TELL US DID YOU NOTICE ANY POWER DIFFERENCE ?????? OR SOUND??????????

Originally posted by bmw528i GRH YOU TOLD US HOW YOU DID IT NOW TELL US DID YOU NOTICE ANY POWER DIFFERENCE ?????? OR SOUND?????????? I've performed the mod... I haven't dyno'd the bike since, but I didn't notice any difference... Sound or Performance. I'm sure the exhaust can breath a little better. The Cat honeycomb is really tight honeycombed and is 4 inches in depth. If you want to do anything dramatic, put slipon's on and install the PCMIIIr. A comparison of the Akra Y pipe and the stock gutted pipe, the Akra would be better for smooth exit of exhaust. Once you remove the Cat, the entry pipe to the Cat Chamber is about 3.5" pipe which expands to the Cat Chamber which is about 5.5" back to 3.5" for the exit and then Y's to two smaller pipes. I would assume that exhaust entering in the larger chamber causes a lot of disrupted turbulance. There is not this problem with the Akra Y pipe. It is uniform throughout up in to the Y Pipe.

Originally posted by bmw528i GRH YOU TOLD US HOW YOU DID IT NOW TELL US DID YOU NOTICE ANY POWER DIFFERENCE ?????? OR SOUND?????????? There is a noticeable difference in sound. Plus my butt is not as hot. And please turn your caps off.....:fact

still pretty hot.. Just got off the bike... My right leg has a tan. and I had jeans on... :D :D :D :D :D :D :D :D

Originally posted by r1-superstar There is a noticeable difference in sound. Plus my butt is not as hot. And please turn your caps off.....:fact :iamwithst

My right leg has a tan. and I had jeans on... What part of your leg? You don't get any radiation heat to the leg, there is a shield. An hot air rather should toast some more delicate parts ;) I yet have to feel something of the cat, but I did feel lots of heat coming from the frame!

I dont trust air I can't see. I am going to do the same to mine once I get it this summer, maybe step it up and pull the whole soleniod inductiuon emmission system, cheap mod..but good mod

Originally posted by Landshark92 What I am partly worried about is the quality of sound. I once gutted the cat on my race car and it changed from nice and throaty to sounding like a thousand wasps were flying around in a coffee can. The cat on a car usually has a much larger chamber than the rest of the pipe. The air flowing nicely in the pipe then becomes turbulent as it enters the hollow cat chamber and made that god awful ricer car on crack noise. If the cat on the R1 didn't have a larger chamber, I wouldn't be worried. I there, just for your info, I took the cat out of my volvo and when I say this I mean everything, the cat and the chamber as well replacing all by a standard 60cm long exaust pipe and the noise that were allready throaty became even "deeper", wonderfull, even leting us ear the turbo "mumbling" hehe see ya Mario

On a Volvo? lol, TURBO BRICK POWER! lol

Originally posted by Eyespy If people want to remove the cat conv, I have no problem with them at all. The contribution these bikes make to air pollution is absolutely negligible. With or without catalytic converters. :fact A change in exhaust on a motorcycle will make no significan change in exhaust output. This is not a f2cking SUV.

Originally posted by XxPornstaRxX A change in exhaust on a motorcycle will make no significan change in exhaust output. This is not a f2cking SUV. Are you saying by taking out restrictive devices in the exhaust system of a R1 will not increase flow???? The principles of a "SUV" are the same of a bike, boat or airplane. Less restrictive = more flow, it's just fact. The only question is how much more power you will get after tuning the bike to respond to the change, no matter what; you will see some increase. The faster you move air in and out of an internal combustion engine the faster the engine will be, that IS A FACT.

I think he's talking about total output of 'emissions' from an exhasut change on a motorcycle.

Well I have removed the emissions from my Camaro and I know it's not great for all the trees and stuff like that. You have to know it does make a bit of a difference, significant maybe, maybe not. If you are going to take the emissions off your vehicle (be it a bike or Vette) at least don’t blow smoke up your ass and say it doesn’t really make a difference. Just my .02 cents :dunno One thing I always loved to see, is when I tell someone about my Camaro, some people say "that's bad for the environment", or "that’s irresponsible", you know the type, the tree hugger like hippies, the funny thing is when they drive away in there 70-80ish POS w/ all they "save the whales" and "one less SUV" stickers on the back and you see the POS puff a giant ball of smoke out the tail pipe lol

Folks, try reading. You are now again discussion questions that were allready answered in this thread. - Pollution increases dramatically if you remove the cat - Power doesn't increase. VPREATR tested it (not astonishing, a propperly designed cat won't cost power) - Sound may change a bit but there is nothing to complain on stock sound i.m.h.o. - the cat also isn't a source of heat. I yet have to realize it is there. Heat is coming from different parts on this bike, parts like the frame for example. Bottomline: It is stupid to remove the cat. More pollution without any reasonable benefit. The argument with the SUV is not valid, a bike without cat polutes more than a couple of SUV!

The 'cat' is exactly the reason for excessive heat surrounding this exhaust as there is the material of which it is made along with the ID of the pipe being tapered down therefore the results some 04 R1 owners are experiencing as well as a few mag testers, hence the reason its made mention of in comparos. I have no doubt if your not in stop n go traffic its probably not an issue but if you are get out the asbestos under panties.:lol :lol :yesnod BD

Originally posted by Juerg Folks, try reading. You are now again discussion questions that were allready answered in this thread. - Pollution increases dramatically if you remove the cat - Power doesn't increase. VPREATR tested it (not astonishing, a propperly designed cat won't cost power) - Sound may change a bit but there is nothing to complain on stock sound i.m.h.o. - the cat also isn't a source of heat. I yet have to realize it is there. Heat is coming from different parts on this bike, parts like the frame for example. Bottomline: It is stupid to remove the cat. More pollution without any reasonable benefit. The argument with the SUV is not valid, a bike without cat polutes more than a couple of SUV! Stupid?? Yeah to you. To the ones that have already done it (myself included), do as you wish. :thumbup 'Juerg', when will you just learn to let it go. :confused: :2bitchsla

another r1-superstar post... So your exhaust is ice-cold now, after you removed the cat, isn't it? No more heat from it anywhere. You are freezing when sitting on it? :D :D :D

Originally posted by Juerg another r1-superstar post... So your exhaust is ice-cold now, after you removed the cat, isn't it? No more heat from it anywhere. You are freezing when sitting on it? :D :D :D And here is one more. :rant :confused::dunno I give up. You clearly have no brain.

the cat does get hot, dont beleive me, go run your bike for a while and touch it, better yet lick it lol

the cat does get hot Sure it does, no argument on this, but it is not the (main) source of the heat some are feeling. And specially not, as I stated, in town/idling, where there is little flow/heat in the cat. Like somebody else said, some people don't know how to analize things and fall in some placebo thinking: They feel heat, the first thing that comes up to their mind is "it's the cat" and from there on the brain goes to idle mode and the statement "I know it is the cat" is published to the world. No attempt to verify! Simply feeling with the bare hand where heat sources are would reveal that there are other, more noticeable sources of heat. Like the frame for example, that gets as hot as the engine, 70-100°C, with your leg touching it!

Lol ok I didnt get what people were saying. If you think the cat generated heat, you need to give me your bike and just buy a bicycle, man if your that dumb.....wow I cant believe people think that that is some funney shit

but it is the main source of the excessive heat SO MANY 04 R1 owners are mentioning/complaining about...........but i guess their all just wrong. BD

Ok, due to the fact it is restrictive of the air flow it will absorbe more heat, kinda like the radiator, but it does not generate heat itself. What I am trying to say is it gathers heat from passing gasses that are got, since it slows the gasses down so the heat transfers into the cat. The cat does not generate it's own heat independently. If all the 04 R1 owners think that the cat generetes heat they are wrong and should be pimp slaped.

Car cats get hot enough that they can start dry grass on fire. Folks here in Colorado and any other dry states have seen evidence of that.

Not exactly Supercharged, I'd be more restrictive with calling people dumb! A cat actually does generate some heat through its chemical reactions (or they would not happen, basic chimestry knowledge). So actually it is a hot brick in the system. The cat can get as hot as 1000°C inside. But it does not generate heat because it is restricting the airflow (the R1 cat is designed to not restrict, that's why it doesn't cost power and that's also why claims that the motor runs cooler are :bs) (Sidenote: During break-in the internal friction goes down, that's why some people see their motor running cooler) However, the cat is insulated against its casing and the heat is transfered out of the exhaust system by the exhaust gas flow, at least as long as the motor is running. So yes, a catalized exhaust is hotter behind the cat when significant gas is flowing (i.o.w. if you are riding fast where the wind will take the heat away), but when the motor is idling the heat generation by the cat is neglectable. And as far as I can tell, heat may get a problem only if you are standing still. But this is true for any big supersport bike because the hot motor below you is a good oven!

Ok, so you saying that if I take the cat off a bike, and lay it down it will get hot. Damn I guess I dont have to pay my heating bill, I'll just go to the junk yard and fill my house up w/ cats. This thread is boring me, I dont think I'm gona reply to this one again lol.

Am I saying that? I don't think so.

Originally posted by Juerg A cat actually does generate some heat through its chemical reactions The cat is heated by the gasses passing by it. as I said before, I quit, you guys can argue this till the cats come home, this is giving me a head ache

Ok let's try to make it so easy that you also understand: When do the chemical reactions in the cat happen? -> If exhaust gases of a combustion engine are fed through the hot cat. So if you want to heat your house with a couple of R1 engines and cats, this will work, as long as you keep the engines running. But the cat itself won't do anything. Got it now? P.S. The initial heat up of the cat happens through the exhaust gas, but when the chemical reactions start, the cat itself heats up even more.

Car cats get hot enough that they can start dry grass on fire That's correct. Once the engine is switched off, the heat is not taken out by the gasflow any more. So what happens is that in the first minutes after stopping the engine, the cat housing is heating up a lot because the hot cat core is transfering its heat to it. If you have stopped from running hard, there is quite a lot of heat, if you stop from cruising around easily it is rather neglectable. But specially on cars, dry gras touching the hot cat may be set on fire.

This may be beating a dead horse, but the catalytic converter WILL increase the exhaust temperature because it completes the CO -> CO2 reaction which releases additonal energy. Carbon monoxide (CO) is one of the main exhaust elements that is converted. The nitrogen oxides are produced in lesser amounts. Originally posted by SuperchargedRS Ok, due to the fact it is restrictive of the air flow it will absorbe more heat, kinda like the radiator, but it does not generate heat itself. What I am trying to say is it gathers heat from passing gasses that are got, since it slows the gasses down so the heat transfers into the cat. The cat does not generate it's own heat independently. If all the 04 R1 owners think that the cat generetes heat they are wrong and should be pimp slaped.

Where are the mods.. I try and try to read through the pages of BS, but the 3 year olds with computers reduce this thread to crap like so many other otherwise useful threads. I would like to know the results from the dyno too.

DAMN i finally removed my cat today. Took longer than I thought though. I havnt ridden since it was done but I hope its cooler in the seat. On a related note, I have a screw left from this project (which also included fender elim kit install and all 4 turn signals replaced). Is that bad? I also lost 3 that I gotta replace. What sucks is I never left a 300 sq ft area. How the hell did I do that? Lol Hide

Interesting.... Mines gone, oh well... http://auto.howstuffworks.com/question66.htm http://auto.howstuffworks.com/question482.htm

what about the sound :boobies

Originally posted by racedurpie what about the sound :boobies Oh god, it has been resurrected. Do you know what you did?

one more time. No big change... Originally posted by racedurpie what about the sound :boobies

There are some that say it does indeed sound a bit more growly than stock:lol

a have already the devil slipon

I did my cat removal and can tell no difference whatsoever in the sound. The under seat heat is a bit better but its still warm. Hide

thanks for the reply

Hello, The removable of the catalytic converter will give you more sound and about 3extra HP. Also, you lose about 3 pounds by replacing it. this is what devil bikes has replied what do you think

I removed my cat two days ago. I dont know if its just me or if it did make a difference , but 5,000 & 6,000rpm seems stronger. I did notice that the heat isnt as bad any more. It's also deeper sounding.:rock

to put the weight issue to rest I just put the honeycomb that came from the cat on the scale. 2 grams... 3 pounds, no where close. Originally posted by racedurpie Hello, The removable of the catalytic converter will give you more sound and about 3extra HP. Also, you lose about 3 pounds by replacing it. this is what devil bikes has replied what do you think

hey my ex-gf's name is cat :rock

Is there any cat converter in 03? If yes, where is it situated? :dunno

No cat in the 03 :hellobye

Originally posted by KNEEDY R1 No cat in the 03 :hellobye Thanks dude, tot that i need to pull it out if there is any :lol

I just rode my 04 on a short trip... 93mins, 85deg outside 171deg engine seat became almost unbearable... will taking the cat out help? or changing to slipons?

There seems to be two versions of 04 R1, one series without insulation, where the seat gets unbearably hot and others with insulation, where it gets slightly warm but far from hot... ( J.K.... ;) ) That's the only explanation for such inconsistent reports. My seat does not (or better did... it is stolen) get hot, the frame however does. This has been discussed over and over, it is all in this thread...

Same here. I did a 1900 mile Blue Ridge trip and each day was in the 80's. No more problem than with my 954 or 98 R1. I think all the discussion makes people overly sensitive. Either that, or I'm in for a big surprise when I ride from Pa to Tx and back in July.

Originally posted by Juerg There seems to be two versions of 04 R1, one series without insulation, where the seat gets unbearably hot and others with insulation, where it gets slightly warm but far from hot... ( J.K.... ;) ) That's the only explanation for such inconsistent reports. My seat does not (or better did... it is stolen) get hot, the frame however does. This has been discussed over and over, it is all in this thread... Hit 92 here in south Mississippi the other day and I rode it all day. Only noticed heat three times... 1) sitting in traffic cruising the beach w/ some pals checkin out the ladies on the beach... the seat became slightly warm... my Joe Rocket Pheonix jacket has made me feel hotter than this. 2) again sitting in traffic the fans kicked on and wooosh... breeze of stale hot air on your legs up front. That's pretty bad, but hey... I was posin' so that's the price. 3) Did some hard riding later on and eventually it was pretty bad around the frame spars at your knees. This is, I think, the hottest part of the bike the rider will feel and it really does get pretty awful... but not unbareable. Slide back in the saddle and problem solved. Honestly, I don't think the undertail exhaust heat is a problem at all... half the time I forget its even under there.

so with the underseat exaust it gets much warmer than other bikes. I haven't gotten a chance to ride it yet. Any one who has gotten a burnt ankle would complain the same about heat from the pipes in that location too though. Anything found to fix this?

Well you've modified the stock exhaust now what's next? Seems like its time for the next step; dyno and compare against a full race or slip-on's.

Well it lools like this is finally back on topic so I thought I would post a reply. Hard to read through all the :argue I removed the cat on my 04 R1 and noticed a "slight" increase in "seat of the pants power" feel in the top end. But unfoutunaltely it made the lower end power worse (again, feels worse.. no dyno). But it definetely ran worse. (Sputtered, surged, back fired) below 8000 RPM. Above 8000 no problem. I read on another forum that I should get a "race" filter to help the way it runs down low. So I did (BMC) and it completely restored it back to the smooth running R1 that I bought. I got even more seat of the pants power gains with the filter. The filter was $100. Everything else is stock!. (no cans, no Powercommander). I am planning a dyno run as well. I have a friend that has a mid-pipe with the cat still in it and I still have my stock filter so I will compare stock with (no Cat, BMC race filter) and let you all know. Bottom line: if you take out the CAT, get a "race" filter at least. It helped the way it runs ALOT. On the heat under the seat topic: I remember feeling the unusual amount of heat under the seat before I removed the cat and I honelstly have not not felt an "unusual" amount since I took it out! I really have forgotten about it until reading this reminded me that it was a problem (with cat in). My advice: Take the CAT out, get a "race" (must be race, not street) filter and get more power, sit on a cooler seat!.. And if you want to save the planet ride a bicycle!.... Cyclebuff68

Removed mine several weeks ago........ Slightly noticable sound change, "nothing to significant" Power increase??? Maybe, "definitly not a loss of any kind though" Heat??? Yes, very noticable!!! Main reason for the operation!! I can ride with shorts now!!! <----- Start preaching here!! :no

Heat??? Yes, very noticable!!! Main reason for the operation!! I can ride with shorts now!!! <----- Start preaching here!! Oh come on, stopp kidding! Your knees are touching the frame (below the tank) if you are riding in a propper riding position. The temperature of this frame is (regardles of the cat) about the same as the temperature of the engine (up to 100°C in town). I would like to see you touching it with bare knees. ;) The heat of the cat is coming up rather behind the rider... this also has been discussed over and over in here... Independent of that, any big bike is frying you on a hot day in traffic! It was no joy on the 02 R1, it is no joy on the 04. The 04 is more compact / higher performance -> hotter, but so are all new 1000cc... also the Kawi that has a side exhaust. Ask ZX10 riders about their right leg!

right leg :thumbup left leg :thumbup BD

Originally posted by cyclebuff68 Well it lools like this is finally back on topic so I thought I would post a reply. Hard to read through all the :argue I removed the cat on my 04 R1 and noticed a "slight" increase in "seat of the pants power" feel in the top end. But unfoutunaltely it made the lower end power worse (again, feels worse.. no dyno). But it definetely ran worse. (Sputtered, surged, back fired) below 8000 RPM. Above 8000 no problem. I read on another forum that I should get a "race" filter to help the way it runs down low. So I did (BMC) and it completely restored it back to the smooth running R1 that I bought. I got even more seat of the pants power gains with the filter. The filter was $100. Everything else is stock!. (no cans, no Powercommander). I am planning a dyno run as well. I have a friend that has a mid-pipe with the cat still in it and I still have my stock filter so I will compare stock with (no Cat, BMC race filter) and let you all know. Bottom line: if you take out the CAT, get a "race" filter at least. It helped the way it runs ALOT. On the heat under the seat topic: I remember feeling the unusual amount of heat under the seat before I removed the cat and I honelstly have not not felt an "unusual" amount since I took it out! I really have forgotten about it until reading this reminded me that it was a problem (with cat in). My advice: Take the CAT out, get a "race" (must be race, not street) filter and get more power, sit on a cooler seat!.. And if you want to save the planet ride a bicycle!.... Cyclebuff68 I have a PC3 installed and Micron slip-ons, If I load the M4 slip on map(cat eliminated map) will the racing filter still be necessary? I can get the filter, but I'm bored and was thinking about popping that cat out? whatcha think? Will she run ok or should I just wait?

Originally posted by Shnapper I have a PC3 installed and Micron slip-ons, If I load the M4 slip on map(cat eliminated map) will the racing filter still be necessary? I can get the filter, but I'm bored and was thinking about popping that cat out? whatcha think? Will she run ok or should I just wait? Shnapper, I have a theory, and those who know enough to correct me please do!...but my theory is, if you decrease the backpressure (slip's or remove CAT or both, no matter what your fuel setting from a PC3 map- rich or lean), you are actually increasing the "potential" for exhaust flow!...I say "potential" because you may not actually be increasing the mass of exhaust flow. In order to increase the mass of material that goes out the tailpipe you have to increase the mass of material that goes in!..(closed system). Your PC3 map does this up to the extent that your filter will allow, by opening the butterflies more at a given RPM (more air and fuel) but if your filter is restricting inlet flow your map is not working to it's full potential. Another way to say it is, you want the map to regulate the air flow not the filter. Your stock filter was likely designed to match the flow of your stock exhaust and the stock fuel air settings!.. I think you need to give your engine every oportunity to get ALL the air it may need. Here is a suggestion: Before I bought my BMC filter I took the bike for a test run with NO filter. I found a road that was well traveled (no rocks) and ran it with NO filter. I ran it slow for a while to make sure there were no rocks stuck to my tires. (Your front tire will throw little rocks out in front to be sucked in). I didn't do this but you may want to tape some rags over your RAM air inlets too. Try to listen (no helmet) to the way the thing runs about 4000 RPM before and after you do the NO FILTER test. Mine surged and sputtered (needle would not sit still) at 3000-5000 RPM and had no low end torque. Yours may not do this at low RPMS with the map because the map has a more (butterflies open) setting at 4000 and the filter is not yet restricting flow. But you may notice a HP difference above 8000. I say do the NO filter test and that will answer your question about the filter. As far as the CAT goes, I say tear it out!...Especially if your map calls for it!....I think I am the only one that has mentioned regretting taking it out but that was before I got the filter!... Hope this helps. As you may notice I am obsessed with the subject of motorcycles so sorry for the long reply, I just don't really want to work today!... Let me know haw it goes!... Cyclebuff68

Originally posted by Juerg Oh come on, stopp kidding! Your knees are touching the frame (below the tank) if you are riding in a propper riding position. The temperature of this frame is (regardles of the cat) about the same as the temperature of the engine (up to 100°C in town). I would like to see you touching it with bare knees. ;) The heat of the cat is coming up rather behind the rider... this also has been discussed over and over in here... Independent of that, any big bike is frying you on a hot day in traffic! It was no joy on the 02 R1, it is no joy on the 04. The 04 is more compact / higher performance -> hotter, but so are all new 1000cc... also the Kawi that has a side exhaust. Ask ZX10 riders about their right leg! Um...... I hope to God that the frame on my bike is not the same Temp. as my engine at any time!!! :hellobye When i first got the bike, the heat from the pipe "on the right side" would fry the hairs on my inner leg and on my ass. Regardless of the heatsheild, there is heat coming from that area of the pipe. I then remove the cat, and continue riding as usual. I can still feel some heat from that area, "there are pipes running there after all" but my ass hairs are still fine to this day. :)

OK......... The cat is out of the bag, as I explained before I have Micron Slip-ons and a PC3usb. I popped the cat out yesterday, took a while as I didn't realize a Cat was made of metal. All these years I thought cats were ceramic? Hell don't ask, I just figured it that way :lol Peeled the metal out with hammer and long flat head screw driver and reinstalled everything. I loaded the M4 map because the M4 map is designed for no cat, the Mircon map retains cat. Stock filter is still in place, I will most likely get the BMC race filter. The bike runs great, but I feel it can run a tiny tiny bit better down low. Could be the map allows more fuel and I'm not getting enough air in as stated by another. All in all if I left it alone I would be fine, but I might as well experiment a little with the air filter to find out. It was worth it IMHO because she breaths better and sounds a tiny bit deeper. :fork Update........ Took my bike out this morning to the local lake road......... I know this road very well so it gave me a chance to really see how the bike ran without the cat. It runs great, I have no complaints and yes it is stronger on top now without the cat in the bag......Down low it feels about the same which is a good thing because I was worried I might kill the low end opening up a huge hole and not custom mapping the bike. Ok so, Micron slip-ons, cat removed, M4 slip-on map, stock filter. :thumbup

This post was intended for a guy that asked about a manual or instructions on taking out the cat but I can't find his message now so he must have removed it......but here is my repy any way: Taking out the cat voids your 1 year warranty (FYI) so I would leave it in if your conscerned about that, but there is no "official" manual for taking out the CAT that I know of. I am sure you can get a manual that tells how to take out the mid-pipe which is where the cat is located. If you just want instructions in words here it is: The CAT is located in your "mid-pipe" it's the portion of the pipe that splits the flow into the two smaller diameter pipes that go the mufflers. Some also refer to this as a "Y" pipe. You can also recognize it because it has a large diameter section in the "stem" of the "Y" that contains the CAT. It is located right next to your rear shock. You have to remove both mufflers to get the mid-pipe out. The hardest part to removing the mufflers is getting the upper plastic trim piece off your tail. There are two plastic riviots (one on each side under the edges) that are a bitch!...Unbolt everything else first and do the side riviots last. Once you get the upper plastic trim piece off there are muffler mounting bolts under some plastic covers and the clamps on the pipes that allow you to get the mufflers off. Once you get the mufflers off the next thing is the mid-pipe. Loosten the clamp and the support bracket to pull the mid-pipe off. Once you get it off you will need a concrete chisel or a heavy duty screwdriver to get the CAT out. Find a way to support the pipe in a vise with some rags so you dont scratch it or something. You will need both hands available for the hammer and chisel. You will feel like a vandal while your tearing it out. You have to get somewhat violent!... I am still trying to find someone around here that put on a full system that is throwing out the mid-pipe with CAT still in tact so I can run mine against my "no-cat" run. I got 156 RWHP with the cat removed and BMC filter. I need to return it to stock or run a stock bike to convince myself that there is actually an advantage to taking it out. I have seen some STOCK dyno runs that claim 156 RWHP too so Read previous messages but you definitely want a RACE filter or a PC3 or both if you are going to tear it out otherwise it will just run like shit. Good luck.

Originally posted by cyclebuff68 It voids your 1 year warranty (FYI) so I would leave it in if your conscerned about that, Read previous messages but you definitely want a RACE filter if you are going to tear it out otherwise it will just run like shit. Good luck. That is not true or it doesn't apply to those with a power commander. Stock bike without the CAT. and no commander may run like shit with the stock air filter. My bike how ever with a PC3, the M4 map designed for No CAT and stock filter works very well................ :fork

I was editing my original reply at the same time you were writting this, to include the case where you have a PC3, stock filter, and no CAT, I am sure that works fine. So if that works with the stock filter, that tells me that your MAP air settings must be like I suspected (more open at lower RPMS) to compensate for the restricted filter. I still believe that the BMC filter will help you on top because your map is compensating for the stock filter down low. That is the only explination if it runs right with the stock filter. Evidently with the map you don't need the race filter down low (because your still below low the max Flow rate of the filter), but the butterflies only open so far when you twist the throttle wide open..so then, the only way to get more air on top is the RACE filter. My previous statement ("you want the map to regulate the air flow not the filter") still aplies, but it appears to aply more for the top end where the stock filter may become the bottleneck!.. I'll bet the PC3 map air settings are more closed down low with a race filter. Anyway, this reply was not intended to dispute your findings. We are both right (once I corrected my self)!... We just said it in different ways. I would be curious to see some dyno results with the stock filter with it's map settings vs. a BMC with it's map settings. Good discussion!... Cyclebuff68

So what do you think? Should I put the BMC race filter in? I was thinking about doing it, but will I need to change to another map? The M4 map states with stock or after market filter? I wonder if that means Like a K&N stock replacement filter, not a race filter? I really don't want to custom map the bike, I can always look for a map that features a race filter and no cat. Hmmm what to do what to do???? :dunno :dunno

If you have the BMC filter, put it in!...I was looking at all the available maps to download and it looks like the maps are for EITHER a stock filter OR a aftermarket filter. SEE LINK http://www.powercommander.com/411-411.shtml so I don't know if that means that the maps are the same for either filter or the maps are different and the software allows you to choose which filter you have when your loading it into your PC3. I say put the race filter in and try your current map. The potential for more air is ALWAYS better. If you don't have a BMC filter yet, try it without a filter at all!...see previous about preventing rocks from getting in your ram air intakes!... Let me know because I am planning a powercommander in the near future. Cyclebuff68

I got to thinking about what I said in the last reply and I think I need to make it clear that just because you buy an "aftermarket" filter you may not be getting improved air flow over stock. There is a difference between a "RACE" filter and a "STREET" filter. See these links. http://www.factorypro.com/Prod_Pages/prody70.html http://www.exoticsportbike.com/bmc.htm Yamaha has a "high-flow" washable filter that looks pretty good for the price (see link) http://www.yamaha-motor.com/accessories/acscitemdetail/1/1/6/5/183/2025/All/1/4365/detail.aspx Here are the BMC filters http://www.bmcairfilters.com/VisModel.asp You can't even buy a K&N filter for the 04 R1 yet see link. http://www.knfilterchargers.com/search/appsearch.aspx I would be willing to bet that the "aftermarket" filter that is mentioned on the powercommander web site is implied to be a "street" filter and is not much different than stock. And that is why they imply it doesn't matter for the map ("aftermarket or stock"). but the link above says that you have to re-jet (01 R1) for the race filter but not the "street" I would assume it would be the same for an 04 R1 (must re-map for a race filter but not for street). Anyway. Shnapper .....make sure you get a race filter 15% more flow over aftermarket street or stock. Cyclebuff68

- Someone has tried the Y tube of Akrapovic or Arrow to eliminate the Catalyst? These tubes costs around 140,00 euro or dollars and give us the possibility to restore the stock Y tube with the catalyst. Very important in country as Italy where any vehicle is revisioned periodically. - Someone has verified on Dyno any performance change after removing the catalyst? Thanks!

Hi I have got Two Bothers Race can's on my 04 R1 and I'm going to be fitting the Akrapovic Y pipe tonight. I will let you know how I get on and if I find any difference in the two.

Well I have got the akrapovic pipe on now. I had to play with air/fuel mix to get the bike running right until I can splash out on a Power Commander. The bike is running about 5o cooler than with the cat, and it's much cooler about my legs on a run. The sound has changed, it's harsh now, I like it!!! www.a1nets.com/r1/

Originally posted by UK R1 Mad Well I have got the akrapovic pipe on now. I had to play with air/fuel mix to get the bike running right until I can splash out on a Power Commander. The bike is running about 5o cooler than with the cat, and it's much cooler about my legs on a run. The sound has changed, it's harsh now, I like it!!! www.a1nets.com/r1/ So the Akrapovic Y connector will work with slip-ons of another brand? I take it you could have used it in conjunction with the stock cans also. Can you take a fresh pic of the set up now that it's on your bike so I can see the whole system from the Y connector back to the cans? :thumbup

Yup it will also work with standard cans. I put some pic's up of how the bike looks now. Bit out of focus but will do for now. http://www.a1nets.com/r1/photos.htm

Originally posted by Juerg Folks, try reading. You are now again discussion questions that were allready answered in this thread. - Pollution increases dramatically if you remove the cat - Power doesn't increase. VPREATR tested it (not astonishing, a propperly designed cat won't cost power) - Sound may change a bit but there is nothing to complain on stock sound i.m.h.o. - the cat also isn't a source of heat. I yet have to realize it is there. Heat is coming from different parts on this bike, parts like the frame for example. Bottomline: It is stupid to remove the cat. More pollution without any reasonable benefit. The argument with the SUV is not valid, a bike without cat polutes more than a couple of SUV! Cats need to be at high temp to function removing should reduce overall heat buy a noticable amount. this seem to be the only gain and what my toasted chesnuts are look for. can any one who has done the cat destruction comement on this factor.

The smell of roasting nuts is gone after I took the cat off. I would say the bike feels about 5o cooler than before.

I have punched out the cat. Reason: was running race fuel, and was told it would melt the cat. When I did take it out I hadn't seen any damage to it. But did noitced if it had taken out the whole cat. out there would be bigger space in diameter, So I only punched out the middle of the cat. so it was even with the rest of the pipe. Call me crazy but, runs little cooler, runs like shit down low. But I think its just the humid weather. stock filter, micron slip-ons, no Pc3.

Originally posted by pep-02R1 I have punched out the cat. Reason: was running race fuel, and was told it would melt the cat. When I did take it out I hadn't seen any damage to it. But did noitced if it had taken out the whole cat. out there would be bigger space in diameter, So I only punched out the middle of the cat. so it was even with the rest of the pipe. Call me crazy but, runs little cooler, runs like shit down low. But I think its just the humid weather. stock filter, micron slip-ons, no Pc3. You need a race filter, not just any old "aftermarket" filter you need a HIGH flow filter. I am speaking from PERSONAL experience. You will get even more in the top and it will restore the lows Read my previous messages in this thread!...

:eek: don't see the point in changing can's/cat, can anyone honestly say they ride the 04 at 13000rpm in every gear , with high 140's bhp at the back wheel :confused: , plus in the uk the police are aware of race cans, so its not really worth it unless its the pose factor, this bike will clutch up in 3rd :rock 4500 miles still smiling keep it safe, rob.

Down here in POrtugal the problem with the cat is the heat that boils my ass like an egg when the outside temp goes over 30ºC and I can assure you it goes well above that almost every day during 4 month and some times it goes really high, like around 45ºC. The 2000 R1 I could ride it even on the hotest days of the year, but the 04 when it´s over 38ºC it´s impossible no matter how high in revs you ride it, sadlly I can only use it at night, leaving day time for the car and it´s AC, and this is the main reason why I will probably remove the cat converter. Thanks

Originally posted by GRH After the exhaust pipe was removed it took about 10 minutes to get the converter out. Can't ride yet, started snowing this afternoon. snowing? where the heck do you live?

Snowing????? Holly shit, where do you live??? on the north pole??? hehehe

Originally posted by Greg Crowe Stock jetting is usually a little rich on the top end and a little lean in the low/mids. Gutting the cat shouldn't screw up the mapping as far as top end hp. He should actually see a small gain in top end hp. It's kind of like installing a better flowing can on any other bike. You will get a small gain and you don't have to remap with a PC3 but you might get a little more gain with a very mild midrange remap. There is no chance of hurting anything by gutting the cat. I am curious to hear if the midrange and light/cruise throttle feels lean at all....... any light surging? I doubt just gutting the cat would cause this but gutting the cat AND install aftermarket cans together might lean out the mids enough to feel it. Thanks for the pics, those are great! Without having to search through additional posts, can you tell us if you're still running the stock cans? In looking at your pics, it appears that the cat was only about 1 1/2" thick. Is that correct? One thing I that is bothering me about you knowing what you're talking about and all is that a 2004 R1 is fuel injected and doesn't have jets.:fork

Jetting/mapping............. same thing......... whatever. Bottom line, screw the cat and go with a full system :D

Tell us why you say "the whole system " ? Rob

:iamwithst Now I do have to agree with that, Definatley the full system. Slip-on's mainly just change the sound. Removing all the emmissions Bullsh*t is what gives the most power increase.

Originally posted by Juerg And it was just the cat, yes? You didn't change anything else like the mapping for example? And you could not have gained this power with the cat in place, no? What do you think what next generations might judge to be more relevant, a destroyed environment or a gain of 0.1" in a 1/4 mi run? If you have a bike that is just used for drag racing, I don't mind, it won't make significant miles and will not contribute to pollution. But this is not what we are talking about here. We may have had the cat later on the road over here but at least we have understood what it is for. You know, if somebody brought in valid data, showing that the cat costs significant power, then I would at least understand why people hollow out the cat, but just doing it without knowing anything is beyond what I can understand. (Valid would mean: Take stock R1, make custom map, dyno it, remove cat but don't change anything else, remap, test again). Your understanding is unnecessary. Go get a job with Greenpeace.

when you gut the cat does any check engine light come on and do u have to remap or will it be fine?

When you take the CAT out or use a new Y pipe like I did it will not change the way the bike runs e.g. making it run very hot or lights coming on. All that CAT dose is fillter out co2 gas. :beer

and slow the air down!

Originally posted by johnnyactor Your understanding is unnecessary. Go get a job with Greenpeace. i am with him greenpeace it is. You go out and spend $10,000 on one of the biggest, fastest bikes on the road. Your bitching about a fckin cat give it up and sell your bike and get a goped.com

i guess thats the same thing as getting the akropovic y-pipe except alot cheaper and it looks easier than everyone told me it was gonna be. thanks for the step by step pics it'll really help me out im gonna get to it in a lil while. xx1 QuIcK R1xx

i gutted my cat a couple of hours ago and it feels alot smoother.the bike just feels better all around. JUST GUT IT!!!!!!!!!!

After spending the last hour of my life reading through this entire post, I am 90% sure I will gut my cat. I am mainly concerned about reducing heat, and if there is a power gain, that would be great.

I'm thinking about gutting the cat too. But I don't intend to fit in a PC3 or a "race" filter. What I'd like to know that... if I gut the cat and do nothing else, will it make the bike - run lean - run jerky/erratically at any given rpms - lose low end power (and streetability) I don't really care for any HP/torque increase. And I'm fine with the heat under my ass. But I am hoping that with the Cat removed, my damned radiator fan will come on less in traffic.

there is a guy selling a header y-pipe and one can on ebay...would be good for someone wanting to test it out first and have a spare stocky.....

Originally posted by tjstonerR1 there is a guy selling a header y-pipe and one can on ebay...would be good for someone wanting to test it out first and have a spare stocky..... TS did you gut your cat when you fitted the modified slip-ons? I had one set that I offered that included the y pipe that I gutted the cat on. It takes a fair amount of hammering to get it out.

This thread is funny. It should be used by highschool teachers as an example of the kind of information you can expect on the internet. Its been months since I got a tickler on this, but read it again tonight. Absolutely no value. From all the activity you'd think that by now somebody who was into this kind of stuff would have done the simple test of just doing a Dyno Before and After. But no. Nothing but conjecture back and forth with no conclusion whatsoever. Don't get me wrong. Great forum. I just can't figure out why nobody has any verifiable information! Let this thread die an ignoble death.

Wow..after reading this post, I need a beer! Guess I'll be gutting my cat and we'll see how it goes!

From all the activity you'd think that by now somebody who was into this kind of stuff would have done the simple test of just doing a Dyno Before and After. But no. Nothing but conjecture back and forth with no conclusion whatsoever. :D you are soooo right... I was not here very often in the last months. But nothing missed from a technical point of view regarding the main questions: - What is the main source of heat (I really have to get that infrared cam and shoot a pic of the bike, to end the discussions) - Impact of cat removal on power delivery: No answers - What causes the dip at 7k rpm: No answers... ;) Is there really nobody out there who is ready to provide a before/after dyno?

Those of you experiencing the dip at 7,000 rpm may want to check the EXUP valve adjustment. I found mine way out of whack either from the factory or the cable stretching quite a bit in the first two thousand miles. I made a post about this earlier on checking it.

I just read this entire post and only about 1/3rd of it was semi informative. The rest was childern bickering over emissions, green peace, etc. I'm sure heat will be reduced without a catalytic convertor since inorder for the catalyitic coverter to work properly it must heat up. The honeycomb inside stays hot to burn off and reduce unburnt gasses being passed into the atmophere. So ahving a reduction in rider tempature and incressed comfert is very possible. I was told by a sales rep for Devil exhausts at a motorcycle trade show that an aftermarket exhaust and Y-pipe w/o a cat on a '04/05 R1 does not need remapping and won't run lean due to the exup valve. Is this true? How many of you have a aftermarket exhaust without a catalyitc convertor or a gutted stock exhaust without remapping the bike? Does it run lean? Backfire at all? Blow flames? A guy I rode with a while back had a BMW bike and purchased some aftermarket exhaust for it. After that it wasn't safe standing behind him when he fired it up.

I didn't change anything on the bike at all except take out the CAT. The bike runs much cooler. Can't tell any difference in horsepower...but the sound is a little more throater for lack of a better term. I did find my EXUP way out of synch when I checked it at 1000 miles...don't know if it was that way from the factory or the cables strectched that much is that short of time. The bike pulls the front wheel up at 10,000 rpms in 1,2&3 when new, but now it doesn't do that...still fast as can be for me. I don't wheelie the bike, or stunt it, just ride the twisties and take it to the track for lapping days. Would buy another one tomorrow if I needed to.

so i get my 05 next wednesday once run in do i de cat or not , someone must have dynoed there bike then ripped the cat out realy need to know if it gets rid of flat spot in rev range on the 05 if so may rip it out heat aint a prob over here as its cold nearly all the time cat:boom

Well I couldn't read all of this topic so I skipped to the end. I will be leaving my cat intact and putting on a set of slip ons. Has anyone used header wrap to insulate the the y pipe and any other pipe leading to the cans ? That would make things cooler and probably increase power too.

gut some cats.

Has anyone consider the EXUP valve. If the cat is removed which has some back pressure the EXUP should be removed If you re-adjust the exup for more back pressure ,,ummm you're putting the brick back in the exhaust flow.

i gutted my cat the same time i installed race baffles in the stock cans. havent got to ride it yet because if salt and sand on the road, but from starting it up the sound is a 1000 times better. a lot deeper and after it warmed up i didnt notice as much heat coming of the y-pipe. and getting a pc3 and getting it dynod sometime in april, so i will post the results. sorry no base line read. but i didnt do it for hp although it is a bonus, did it for heat and sound and so far extremely happy..

the fastest way to gut a cat would definetly be to shove an m-80 down the pipe and run! if this doesnt work, retry with a blockbuster, greatest thing is that no tools are required:thumbup LMAO! no seriously, has any loss of lowend torque been noticed after the cat has been hollowed?

no i didnt notice and loss in low end, i would think more of a gain. i def notice less underseat heat as well.

Just want to know, if I have bmc race filter , cat taken out of y-pipe ,and race baffled stock cans, is my 04 r1 going to run smooth.Has anyone dynoed there bike with these modifications?I do plan on getting pc3 but not right now, do not no what kind of map i would use as well. Am curious as to horsepower gains, between say aftermarket y-pipe and cans, compared to guted stock y-pipe and race baffled cans, both of which having pc3. Questions everyone wants to no!

if u get the race filter you NEED a pc3 and a new map, dont have any numbers so i cant help but i am curious if someone actually does. but i had a pc3 from the begging when i did my mod and it runs good with a generic map.

Originally posted by Juerg Go read again! My point was two things: - it is stupid and irresponsible to remove the cat without evidence that it really costs considerable performance. Nobody here actually knows if it does make sense. It may very well have just the oposite effect because there may exist all sorts of turbulences in this empty cat housing afterwards. - if the gain is just 2hp I suggest to leave the cat where it is and to spend some energy in better drivers skills instead. This, for 95% here, will have better results on the track. Dude, that is a big misconception you live in. you can remove the cat converter of all the R1's produced in the world, add all the combustion engines to that group as well. turn on the engines, floor it and run it for 100 years and you still not put as much sheeet in the air as volcano erruption. and that is a fact.

Hi dude, I think your´e living in a world of your own, when i complained about the cat, and i think it´s the general feeling around here, was about the heat frying up my ass, if it gains or looses power or torke it´s just just a normal consequence if you remove it. I haven´t removed it yet, but the summer is here and when we leave in places where temps easelly stay around 45ºC (110ºF) we shurely have to consider this option. see ya

removed/gutted the cat on my 05.......i've not been to the dyno but i swear there's a small seat of the pants difference....bike seems lil more explosive and un-restricted......i would definitely suggest this mod it's cheap and easy

did it on my 04 lot less seat heat

I receintly removed the EXUP on my 05 and I thought it seemed to run a very little bit better.. Then last weekend I removed the CAT and it defenetly runs better, seems to go threw the RPMs faster.. It also defenetly heats up slower..

well after readin the much argued debate on whether to remove my exup or not i finally did to see for myself and i agree it did help some it goes through rpms quicker and seems more responsive in the 4-7K ranges

Hey guys a couple of quick questions as I have heard a lot of back and forth opinions about this... I recently purchased the material I need to modify my stock exhaust with race baffles, and after much reading I also decided to gut the y-pipe / cat. The main reason for me is the heat - I am in phoenix and it gets freakin hot out here. Any little bit helps. And of course, 2hp for $2... can't beat that! Anyways, here are my questions - 1. Do I, or do I not need to re-map using PCIII and if so, any reccommended mappings? I plan to install the BMC race filter as well. 2. What the heck is an exup??? and why do I want it gone?

ok you won't need the pc3 for all the mods execpt the r ace filter i've heard it leans the bike out alot and remapping is required. i've gutted my ypipe, have 2bros slip ons and still not got the pc3.... now the exup ti's a valve in the exhaust header that is controled by a throttle position sensor..........by removing it its the same as having a full system :-) especially since u gutted ur cat and are doing the race baffles.......also the pc3 will help you get the most of theses mods so it is definitly recommended however if ur in the boat im' in and have to buy when u can and not when u want then it's st ill ok

I wish a mod would remove the garbage here. And I wish Jesus would give the a credit for the 20 minutes I've wasted reading this. Please no more replies to this post unless you have a thermometer up your azz or a dyno report to share with us.....anything else is useless! Seriously..... If you wanna see yourself talk go wh0re up something in the general forum.

Originally posted by cyllo I wish a mod would remove the garbage here. And I wish Jesus would give the a credit for the 20 minutes I've wasted reading this. Please no more replies to this post unless you have a thermometer up your azz or a dyno report to share with us.....anything else is useless! Seriously..... If you wanna see yourself talk go wh0re up something in the general forum. Welcome to the world of forums. Discussions happen... So, how about you relax, go stick a thermometer up your azz, and let me know what you find. Good luck

Originally posted by bluemotev Welcome to the world of forums. Discussions happen... So, how about you relax, go stick a thermometer up your azz, and let me know what you find. Good luck Discussion happens........WooHoo what a dork! I'd look to put a thermeter in my azz butcha tougue is in the way.....poopiepants! .....btw you got that dyno info yet?

Originally posted by cyllo Discussion happens........WooHoo what a dork! I'd look to put a thermeter in my azz butcha tougue is in the way.....poopiepants! .....btw you got that dyno info yet? woooooooooooooooooo!!! nah, my bike is still all torn apart. Once I get it together (hopefully this weekend) I will do some tests. I am more concerned about the heat transfer in the seat though (phoenix is f'n hot). Holy crap - we just had a discussion! D'oh! Any word on that crap removing mod? This thread and your thermometer could use it!

lmao.........thermometer up the ass???? you can tell he's s till a whiny ass baby cuz they're the only ones get temps checked there lmao........and btw some of us dont have access to dynos but i'm a firm believer in the seat of pants difference and i'm tell'n ya this shit works........so if you dont like our discussions then dont enter the forums section cuz that's what they are "discussions"

Originally posted by yz17 lmao.........thermometer up the ass???? you can tell he's s till a whiny ass baby cuz they're the only ones get temps checked there lmao........and btw some of us dont have access to dynos but i'm a firm believer in playing in my pants and i'm tell'n ya this shit works........so if you dont like our discussions then dont enter the forums section cuz that's what they are "discussions" How long have ya bin doing that pants thing? I'm Facking with you ya cracka! and if "I" had access to a dyno I wouldn't be asking..... So how about you....any info on that dyno?

I there cillo sorry to bother you but like you said, this is just cheap talking around here hehe so I think you´ll understand if I ask you one small question like: if you know or know where to find info about unlocking a 2004 R1 speedometer, I don´t know how it works in the States but here in Europe the gauge locks at 299 Km/h (190 miles per hour) even so it goes on reving up for an extra 1500 RPM. Thanks in advance see ya

Mario.....I wish I could help. My best advise would be to post a new thread in the how 2 section........Unless someone following here sees it and can help. Now how about that dyno info? Whatchagot?

lol nope no dyno info though i would love to put my bike on one......i just don't have access right now......i use to race motocross and one of my sponsors had one i'm gonna try get w/ them see if they'll let me..........not sure when i'll get time though it's bout a 2-3hr drive

Originally posted by yz17 lol nope no dyno info though i would love to put my bike on one......i just don't have access right now......i use to race motocross and one of my sponsors had one i'm gonna try get w/ them see if they'll let me..........not sure when i'll get time though it's bout a 2-3hr drive Dat would be bootyfull!

Hi cyllo Thank you very much for your reply to my question, I will post a new thread on "how 2" section. Once again Thank you very much for your time and concerning

I just got my 05 today. I'm going to do this mod just to piss off the dirty, tree hugging, dolphin waxing, otter scrubbing liberal. Hippies suck.:machinegu

what an idiot!

At least you are on the other side of the planet. We have enough liberals screwing over our country already.

Originally posted by ImagineParadise ...................I hate ricers period. Oyea, and "I know a lot of people with supras too" and they aint no underpowered miata. You hate "ricers"? I see you have a respectable post of 3000+ and hate "ricers"? Just two questions..what previous "bike(s)" have you owned and why are you even on his forum? or am I deciphering your term "ricers" the wrong way. :confused:

Cyllo here......I was bad! Got booted. Anyway I will say I didn't notice anything sound or performance wise.........But my Bucket thanks me. Gotta be a 10-15 degree difference down thar!

I just gutted my cat. Like some others I did notice a small acceleration gain (quicker to get up to speed). It does feel a bit smoother and the front end seems to want to lift quicker. But it could've been from wishing it would be there and hitting the throttle more. I had already done the baffles that I purchased off another member here. The sound was good then and it's a little deeper now. THE HEAT IS BETTER!. I don't feel the burning as much. BTW are the cats ceramic coated. They give up lots of dust when they are gutted? Baffles---------------------------------------->$100.00 R1-Forum Garage freebie-Gutted Cat-->$ 0.00 Great sounding bike ---------------------->Priceless

Also got rid of the cat: still...same heat, same acceleration. I would not do it again, imo :no

......not questioning you but. removing 2 pounds of metal that traps/hinders the excape of heated air as well as acts as a home for it and you don't see a heat difference! Didn't really care about HP gains....but again my donkey is happy.

2 pounds ????:eek: Do not think so...rather 0,2 pounds...

Still no dyno results from gutting the cat??? I'll just leave it in.

Get rid of it. The end result is very noticable.

wasup guys, well i've been thinking about gutting my cat for a while now.. just didn't do it cuz i already gutted my pipes and sounds awsome and MEANNNNNNN. SO today i'm taking another step n gutting the CAT :) for heat purposes only hahaha. but yeah.. no DYNO SHT yet.... really hoping to but i don't think i'll be doing that any time soon.. but so far only mods are K&N filter gutted pipes soon to be gutted Cat still running like a champ. DYNO any 1 ? and for the record... i'll stop gutting "cats" when they stop burning the Rain forest... :fire

Ok, its DONE.... I didn't really noticed any sound diff, BUT again my sht. is already wayyyyy loud cuz my cans are gutted... so yeah i guess its a little louder.. went around the block flyin.... fell off pretty quick cuz forgot my wings.. ahhahaha.. but yeah.. didn't regret...

You said you gutted your pipes. Did you do it yourself? How did you fix the perforated pipe inside the can? Just wrapping it with the baffle material it will surely start to rattle later? How does the sound compare to say a Akro/Yoshi pipe?

how did you guys removed the cat without damaging the pipe ends??

Originally posted by calabazin how did you guys removed the cat without damaging the pipe ends?? Read page 1 of this thread!!! please:fact

Originally posted by DeuceRiderR1 I'm going to have my bike dynoed next week. I'm planning on removing my cat also. I''ll have it dynoed again after to see the actual gain if there is any. I'm wondering how long the job took also?:dunno I'm wondering what happened to this guy...never posted his figures. I suppose the gsxr motor blu up before the dyno test could be done...???:rock :fork rules!!!

Originally posted by Interceptor You said you gutted your pipes. Did you do it yourself? How did you fix the perforated pipe inside the can? Just wrapping it with the baffle material it will surely start to rattle later? How does the sound compare to say a Akro/Yoshi pipe? Everything still look stock you can't even tell its mod until you turn on the bike :) it sounds meannnnnnnn if i can ima try to record the sound and then post it up.. first just drill out the rivets and then cut the welds.. theres about 5 of them.. just grind it down, and 'try not to damage the end of the pipe i mean the sides... if u search the forum there's a guy that posted up pics of how to do it. plus my Pipes are gutted meaning there's nothing inside except for the metal net. and it does not rattle at all.:cowboy

Theres video and sound of my dyno run posted in the thread on how to actually do it. http://www.r1-forum.com/forums/showthread.php?s=&postid=1868269#post1868269 Note in that run i have not removed the cat yet.

BTW... thanks for this thread I just removed my cat and now all I have to say is... My Ass... My Ass... My Ass is NOT on fire!!! :rock my butt cheeks thank you and so do I. Note my right legs still a little warm but hey thats usual. Note I also recored my baffles so this helps too.

Yup......the memories of my my cheeks being roasted is down to a slight simmer now. But I just added M4 slip on's and I think between the two I'll be looking to get it mapped soon. Notice a slight r.p.m. fluxuation between 1000 and 1100 r.p.m.'s at idle........Never noticed it before. Originally posted by SportbikerR1 BTW... thanks for this thread I just removed my cat and now all I have to say is... My Ass... My Ass... My Ass is NOT on fire!!! :rock my butt cheeks thank you and so do I. Note my right legs still a little warm but hey thats usual. Note I also recored my baffles so this helps too.

Check exhaust mod thread for my dyno result.

So after reading all this the conclusion is to remove the cat and the EXUP valve. Get some kind of slip on. Maybe remap the bike and you got yourself a full exhaust system for the price of just slip-on's. Is that what everyone is trying to say. Also does anyone know what map you would use with gyt-R slip on's

I have a map if you still need one 05 R1 PCIII USB etc Martyn