what size diameter is the stock exhaust?

2.5 i think

2.5"

2.5"

why are you askin'?

and most aftermarkets are 3inch correct??

some are, some aren't. some say they are and aren't.

the 2009 exhaust will be 3.5 :eek:

lol seriously? what about the cat?

dunno. just going from the press release.

and larger exhaust pipes (now measuring 90 mm across) so it might be just cat back.

Extra weight and noise for little or no power gain. Nice.

the 2009 exhaust will be 3.5 :eek:

From what I saw it's only the tips that are bigger.

That would make more sense... For NA the stock exhaust is plenty big enough..