Well the Top Speed Y-Pipe recently hit the market and I purchased it. Let me tell you that of the several mods I have, this is by far the best performance improvement I've felt. I've got a lot less restriction and feel a lot of gain in mid range. This is all from the butt dyno but I definately notice a big acceleration improvement. I got the pipe for $268.......I would definately reccommend this product!!!
I've also got the Top Speed exhaust to go with it.

 

Where in San Antonio are you? I'd like to hear your exhaust system since I'm looking at the same setup. I heard Top Speed exhausts are loud though. Also, did you get your exhaust locally?