[pothead]

can someone explain to me what the exup is and its purpose, thanx:boobies

 

[martinc]

In short,(and I already wrote that a couple days ago!)its a valve that partially close up the exhaust at low revs to produce more torque by creating a back-pressure effect and opens up gradually to let the flow of gases out easily as the rpms go up.

Toruqe-producing device used by almost all the big manufacturers.

 

[pothead]

where is the exup located,and can i remove it,and what are the effects

 

[martinc]

The exup is part of the exhaust manifold;you can actually see a part of it sticking out of the belly pan.

Removing it is not a good idea,since (answering question #3) the stock exhaust is designed to use it.

The proper way to "remove it" is by switching to a full aftermarket exhaust system.

 

[pothead]

i already have a devil full exhaust on the bike, would it help removing it, the bike is a 2001

 

[pothead]

atleast thats what the guy told me when i bought the bike from him, but the exhaust still makes the poppin sound from the exhaust on deaceleration

 

[37doc]

the popping is caused by the AIS sys. not the exup valve.

 

[pothead]

is there anyway i can stop it:fork

 

[37doc]

Yes, buy some AIS block off plugs from Graves motor sports and install them , it will almost completely stop the decel pop.