I have an '04 Turbo Lite here in SoCal as well. The engine is identical in every way to the GT HO unit, only the programming in the PCM restricts boost and allows the engine to run on regular gas. I installed the Stage 1 upgrade when the car had but 2000 miles on it (now 27,000) and have never looked back. Installation is a snap and the rewards are just incredible. Check out
www.haynesspeedshop.com for the best pricing and service.
A bunch of us SoCal regulars at PTCrew.com get together regularly for mod parties and we'd be more than happy to help you out if need be.