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I installed a complete COBB Stage II kit, plus Turbo Adapters, Plus a new CatBack exhaust system from Corsa with the resonator deleted in exchange for an X-Pipe. It's amazing how this truck has woken up. So much so in fact that I also added 20" flow forged wheels and 6 piston front/4 piston rear Big Brake kit from R1 Concepts.
It hauls ass like a much much lighter vehicle, more car like actually, and with the brakes it also comes to a halt very quickly. I'm happy with the money I invested, and I get a compliment every other day on the look, sound, etc. of my truck.
Given the published dyno results from COBB,,plus the adapters and exhaust, I think that I am definitely in the 600HP range. Frankly, it's stupid fast, but I love it!