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i had a P1SC procharger on my 02 gt and we found out through many different exhaust combo's that any long tube headers or even equal length shorties with h-pipe and straight thru mufflers makes a lot of hp.. the h-pipe made 20 more hp than x-pipe on dyno.. hard to believe huh? and i personally found that dynomax welded mufflers work best, their 2.5 inlet and outlet mufflers open up to 3inch inside muffler.. the more exhaust you can flow with a supercharger the better.. you cannot go to big with exhaust with supercharger.. if you can route 3inch pipe on your car you'd be amazed how much difference it would make..
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