I've been considering the same setup (no cats) myself. Do you happen to have under pics of the Bassani installed on a Gen 1? Is it true duals or a Y pipe into a single exhaust pipe? what size pipe, 2 1/4 or 2 1/2, Is that a chamber style muffler?
for whoever already has the x-pipe, what kind of gains can be seen with it, I have heard that without the cats, there is a good hp increase, but what about "seat-of the pants"