The headers and pulleys can definitely account for the difference. Once I get the M370 properly installed, I'll post in the M370 thread. I also run only one large cat at the Y pipe as opposed to two. Idk if that would be any better or worse. I'm sure the cat is costing me 5hp or so but how many can say they are doing that :P
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Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI
New Car: Under Construction
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