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The numbers are within 2-3 on the wheels (Hp and tq...) so it's all a matter of the sound
x's will be more raspy and h's a bit deeper :-p IMHO the Mac Prochamber is the best :-p
hmm if I ever get LT headers I think I'll get a short offroad H, other than that I wouldn't swap out my X...also, does the catalytic converter really make a difference in the gas smell coming from you're car? if so I think I just found out that my X pipe is O/R