I have the 5.3 w/ a Radix. TOG headers into stock y-pipe and 18" 3" in/out Magnaflow and 3" inch piping after muffler.

I believe this exhaust is really hurting performance and want to make an exhaust system that will support the flow of the supercharger. Let me know what most of you guys are doing for FI exhaust.

I was thinking 3" custom y-pipe with 3" high flow cats and true dual 3" piping with an x-pipe into 2 18" Magnaflows. What would be the best way?

Oh, I live in Cali so smog is a bitch!

 

I am runnin AS&M Headers stock cats dual 2 1/2 into A 22'' Magnaflow dual out 2 1/2 with 18'' x 3 1/2 tips close to what you are runnin. I wouldnt think that exaust is hurting my performance. I hope not cause then Ill have to redo it.

 

yeah I don't think you'll gain a lot by changing exhausts but hey whatever makes you happy....i'm on my 3rd exhaust, just looking for the right sound