Alright so i was told something else now from the cp-e guys that when having a turbo car for exhaust i should just run a single 3" exhaust. They said when spilt into a to it creates back pressure which isnt good for the car? So now im really confused on what exhaust i should do. Please tell me what you think. Thanks

 

a single will almost always flow better than a split....it just makes sense. if you have a good setup for the split, you aren't going to lose much hp though. i'd be suprised if you would loose 5hp on a turbo setup between the 2 exhausts if both were done correctly. one nice thing about the split is you can run 2 smaller pipes out the back and the overall flow would still be good (2 x 2.5 pipes out the back = roughly a 5" exhaust). it all depends on how HP happy you are, will 2-5hp make up for a missing exhaust tip?

keep in mind loosing the muffler/piping on one side will also save you about 35lbs...so that's always nice too.

 

(2) - 2.5" diameter pipes would flow the same as a single 3.5" pipe (not a 5") It's cross-sectional area you are concerned with from a flow standpoint.

Dual 2.5" exhaust
Flow Area=2*(pi*r^2) = 2*(3.141*(1.25)*(1.25))=9.8 in^2 of cross-sectional flow area.

Single exhaust of equivalent flow - solving for "r" using 9.8 in^2 area
(pi*r^2) 9.8=3.141(r^2)
r^2= 9.8/3.141 = 3.119
sq rt (3.119) = 1.76" radius or approximately 3.5" diameter.

5" single exhaust flow
(pi*r^2) 3.141(2.5)(2.5)= 19.63 in^2

 

Hello, what exhaust is recommended for the 2.3 L 07? Having a hard time finding. I have an injen cold air coming. The exhaust is outrageous though, any ideas?