So I have been looking into my upcoming exhaust upgrades. I think I have decided on the catback I want (Pypes). But I have been going back and forth on X or H pipe. From what I have heard from other people I would like either. I have heard the H is better for the muscle car sound and the X is good for that raspier NASCAR sound? I would really like to know how they sound on the upper end. I'm sure both sound good and deep at low revs. Anyone got any good links or sound clips or suggestions? What have you guys got and how do you like it?