Here is the info:
Fasterproms - Independent LSX Tuner & Porter for 94-08 GM Vehicles

He dyno tuned my Camaro at RevExtreme but he can use any dyno I assume. We Gandyed and GTeched the Denali. You are welcome to use the GTech for tuning also, but it is not as accurate on a higher hp car on street tires that will have traction issues. It is pretty accurate on the awd, auto Denali.