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A magizine dynoed them and the x had sumthing stupid like an extra 1/2 horse power.....I have heard it gives of different sounds...Ive only used H-pipes....
I had an xpipe and went back to an hpipe. The x is very high pitched at higher rpm`s. Kinda like the sound of a nascar. The h has a much deeper tone and IMO it sounds better and would sound awesome with flowmaster super 40`s.