im thinking of doin a complete ehxaust system for my 8, the exhaust will be a greddy one but the question is as far as the cat pipe which is better the rotary performance that claims to give you 22hp to the wheels when combined with the greddy system or the b&b cat pipe? could somebody please tell me what the difrence is on these two cat pipes and if the hp claims are true? thanks for the help.

 

22hp when combined with the Greddy? I would like to know if this is true too. Anyone?

 

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