disagree on 2 1/2" pipe. had 3" on a stout 406 sbc,had tail pipes put on it, out behind the rear wheel wells. wasn`t mandrell bent. ( BENDS CAME OUT ABOUT 2 1/2"). I could tell the diff. when I started it and backed it out of the muffler shop. put about a hundred miles on it, pulled them off, went w/ two 3" into 3' flowmasters, then dumped before the rear wheels. get this, those tailpipes made almost 3 tenths diff. on the dragstrip!
if anyone wants 3" dual tailpipes for an 88-98 chev-gmc pick up, (mufflers back, (will have to move gas tank to runem) I gotem layin in the barn, not even rusty yet>-------------bob
