I have the bassani q/t cat-back on my car. With the o/r x-pipe it sounded bad ass, especially at wot. Many, many compliments. I recently traded my x for an o/r h with my friend and it and sounds much deeper with a more noticible "chop" in the tone. Also, that high pitch sound was cut in half. I preffer the o/r x with it, but oh well, it still sounds awesome! Probably why I've had this cat back now for about three years and im still not tired of it.
oh, and im sure the street competition cat back sounds even better and louder. thats what im getting as soon as my stroker is built.