handyandy

Whats the best size for exhaust? 2.5" 3.5"?? And do all the pipes need to be the same size (i.e. midpipe, catback pipes)??

sprostang

2.5 It is good for them to all be the same size. Stock is 2.25

handyandy

Okay cool, my catback is 2.5". Wouldn't a bigger pipe provide better flow??

kcp1989

remember that our modular motors need some back pressure. too much flow can actualy lose power.

sprostang

Not really. You can actually hurt your performance if your pipes are too big. 2.5 is perfect unless your running major HP then its a different story.

handyandy

Oh I see. And btw, I dunno whats up with those attachments in my first post. I didn't attach those. I dont even know how to attach them, haha. How do you attach things like that?

oxfordgt

Sorry my friend but you are dead wrong. Back pressure only robs HP by making it harder for the piston to push the exhaust gasses out. 2.5in is the best size for a NA car or a a supercharger pushing little boost. If you put a 3.5in pipe in it will cause the flow of gasses to slow and in turn cause back pressure. Bigger is not better.