I have a 2006 GMC that is basically stock. I have a cat back Banks system and a BD manifold, but I am looking for a performace tuning upgrade. My brother-in-law(who is a mechanic for a local Chevrolet dealer) has an older Duramax with the Edge programmer but is not completely happy. The power is ok, but he has quirky things that go on. He turned me on to the EFILive programmer, but I am a little worried that I will not be able to get the best performance out this due to the vast programming. After reading a some of the postings, I fear that the programming might make it difficult to get the optimum performance. Any advice would be beneficial?