I'm gonna get a DP for my conversion and already have the CS 2.5 to 3inch single cat back.

I was wondering which would flow better.

The RB power pulse or whatever it's called is a 2.5 from turbo to cat back.

The CS is a 3 inch tapered at the end to meet the cat back.

I'm wondering which would be better.
The RB would be restrictive all the way to the cat back where it would expand while the CS would flow great until it hit the bottle necked 2.5 inch midpipe then back to 3inch exhaust.

I don't have a welder or want to go to a muffler shop. So I won't be modifying my cat back.

I'm guessing the RB might be better just because it doesn't bottle neck.

 

should have gotten the full 3" CS CB.

that said, the RB is full 3" and will flow better, but you're still going to bottleneck at the 2.5" inlet of the catback.

 

RB all the way ! ! !