I had my '99 GT running 15.0-15.1's @ 90 consistently, with pretty minimal mods (intake, 3" dp, ud wp/alt pullies, and a tune) enough to keep up with a stock GTP. Enjoy not having to be concerned with KR for a while. You can get used to launching the car, too. It'll help having some practice before adding on another 200+ lb-ft of torque.