I was wondering if swapping my 3in glasspacks with true dual exhaust(no x or h pipe) for 4in dynomax bullets? I have an 88 iroc with a 305 TPI and the 5 speed tranny. Would there be better flow, would it be louder? Any info on this would be greatly appreciated...
Thanks

 

Would probably be louder, depending on the type of glasspack it may flow better it may not. But to justify 4" bullets I think you're gonna need a lot more power than you've got. If you just want loud run open headers.

 

i also agree. 4in is way to big. if you wanna go single 3inch should be plenty enough backpressure. as for true dual 2.5 in is plenty. do u have any mods?

 

AntsZRS...
Yes the only mods are Bosch platinum 2, cap/rotar, k&n filters, true dual(2.5in), glasspacks(3in)...that is it.