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I would add the x pipe? Maybe you get bad resonance with no crossover. Hard to say definitively, this stuff is very subjective. My car is 600hp 499 with super turbos good sized solid cam and an H pipe, regularly take it up to 80+ mph on the freeway and the sound is mild. Idle is nice but the...

Dynomax super turbos are very quiet, maybe too quiet. My car has 600hp and at idle to 1500rpm the car is pretty mellow driving through the neighborhood. Screams at WOT. I also run an h pipe, I don't think that will have much of an effect on sound volume but if you don't have it and are already...

Try new header gaskets. Remflex graphite work

exhaust leak at the header flange

it depends on a lot of things but I would say 5-10% increase. I added headers and intake to a '71 383 hp and it went from upper 200's to 330. Change to bigger carb and new cam and expect more. All depends on combination of parts used. Bottom line is you will feel the change.

Definitely get headers. They suck to work around when hot but the performance gain is noticeable. I use hooker 1 7/8 comps and tti 2.5" full exhaust, didn't need to mod the headers at all to fit...and I have power steering.

Don't know if they're correct, but TTI makes stainless oval tips (plymouth) that look great on a 68-70 B body. http://www.ttiexhaust.com/Category-Tips/ExhaustExtensions.htm#ova