I've have the Bassani X-pipe, and I've had the Mac off road and catalytic H-pipes and I can say that the H-pipe sounds a little better with flowmasters, but the X-pipe definately makes more power, especially top end. I would go X.
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91 Notchback (formerly auto with red cloth, now 5spd with black leather)
http://albums.photopoint.com/j/ViewPhoto?u=1683019&a=12913072&p=51208533&f=0
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