3" exaust vs 2.5"

[ATI347]

I tried the search engine without luck.

Has anyone done any dyno time with different exaust like a 3" single vs 2.5" dual? What are the benefits of one over the other on the turbo cars?

 

[turbosam6]

On our cars, the only real difference would be between a 2.5" and 3" downpipe, but as far as the cat backs, a single 3" or dual 2.5" are going to be too close to call. The single 3" is lighter.

Going from a 2.5" dp to a 3" dp does offer some pretty good performance gains. HTH

 

[Not Avg 6]

My butt dyno revealed a different improvement. Also my second gear chirp was more noticeable.