This seems like a pretty good rule of thumb. But then I just put a 2.5" on mine, just because it is the old exhaust off of my brothers truck and it was free. I really haven't got to drive it much but it is really quiet, I have the complete exhaust off of a 1997 F-150 with a 4.6, stock muffler and all.
I have no cat and ran 2 1/4" pipe to a Flowmaster 40 series and y piped it to dual exhaust coming out behind each rear tire. (about stock but 2x better)
For
a small yearly donation, you can support this forum and receive a 'Supporting
Member' banner, or become a 'Supporting Vendor' and promote your products here.
Click the banner to find out how.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.