Is there a gain to be had going to a 5" straight pipe over a 4" straight pipe setup? I am about to put on a big single with TST with pressure and smarty and a few other things and thought a 5" would help more but not sure. Input would be great thinks.

 

I'm going to say it would probably help you because of the bigger turbo combined w/other modds you will being doing i'm sure

 

I thought so to but if you go to big it will hurt you more than help you. I like have seen some 6" Bullydog and them guys have all hated it.

 

Ya that seems a little to big unless your setup is extremely far from stock... But I think you will be good w/some 5''

 

I'm running 4" to the stacks.