Quote Originally Posted by Bio248 View Post
3" is a better choice. more flow. remember, you have a blower so you need a way to quickly let the exhaust gases out. there is no reason to have any backpressure on a roots blown system.

sorry i have to dissagree ...so your saying that a with a 3'' dp you total exhaust system will flow better then having a 2.5'' (the same size as the rest of the exhaust)? please explain. I had the 2.5'' off road with stock everything else...the exhaust notes changed a little bit but mostly at lower rpm's