i wouldn't say the a&r baffles are a performance mod, but they sure sound sweet, installation for you should be a breeze, for me it took an entire day. they say to grind out the rivets, but when i did it just melted the excess rivet material to the other material in the cans, it's way easier to drill them out. it would have saved me hours :fact i only ran them for about 5 months before i wrecked hard enough to kill the cans, then i picked up a sweet deal on a used full TI system from a member here. 7 wrecks later, they're still going strong.