To answer the comment about not using my PRP, I have in fact played with my PRP and am currently running one of my "home brewed" tunes. Does it give me the all out performance of Torrie's tune? NO. Is it a compromise between all out performance and daily driving, YES. I have not had much time to really play with it as I do not have money to spend on a lot of dyno time. It is obvious from my personal experience that Torrie can wring the utmost performance from my '03 LS. I cannot vouch for anyone else's LS. Bottom line, when I want to play around and enjoy the performance or when I get a chance to head to the track, you can bet it will be Torrie's tune it will be running on.
Back on the PRP thing, I did not mind the idea of messing with the '04 Vic, but somehow taking a chance with an 03 LS still under warranty is not that appealing. If I could get it to shift like Torrie's when in SST and like mine when in D5/D4 and still get the overall performance of Torrie's, I would have the best of both worlds.