I would say go with MAC... they have one of the best kits out there... the PRO CHAMBER is what I have on my car and it is awesome!!! i would get the long tubes and the pro chamber with the mufflers and tail pipes if i was replacing my exhaust basically the full kit... the long tubes might not help your low end torque, but they will help you up top... some people say that it will kill low end, but i don't see why they would... i am a firm believer in full lengths...
Steve
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Project Bird Turd
GNC Racing Performance
Scarzi's Machine Works