i had 40series flows on my camaro for years, got tired of the interior drone, so i bought 40series delta flows, was told they would help out tremendously by flowmaster themselves. put them on and it sounds the exact same inside! called them and they said i have too much motor (413 sbc). i have 2.5 exhaust w/dr.gas xpipe ran out the back. any suggestions on amuffler system that will give me good exterior sound w/minimal interior resonance? thanks
I had dual spintech race mufflers on my 408sb mopar it was about as far from quiet as you can get. Hooker aerochambers are great, don't drone at all, relatively tame at idle, but still sound wicked when you get up on it.