Quote:
Originally Posted by BlackJack
billy, the difference is in turbo or N/A.
with turbo, you need max flow to get out of the engine, fast as possible.
with N/A, you need some backpressure to retain low-end torque.
so.....with N/A, 2.5"
with turbo, 3"
|
Not going to really change anything, just tweak your post a little to be more accurate.
With turbo, you need max flow to get exhaust backpressure off the turbine to spool as quick as possible.
With N/A, you need to maintain exhaust velocity to retain low-end torque. Backpressure is bad.
To answer sorrowfulkiller's original question, a single exit 3" exhaust will flow the best. A dual exit system will not flow any better, but will not flow worse either, so you will not gain or lose power. Duals are pretty much just for looks. You will gain power with just the 3" cat-back mostly in the upper rpm's and shift the low end torque higher up in the rpm range.