I called Dan at PPE a month ago, and got nothing impressive. I have dealt with him before when I had a Duramax. They have a great product for chevy. But after listening to him I was not impressed. It basically does nothing but add an approximate hp rating. WTH does that mean I asked and he said it had not been tested much. Told me to call back after SEMA to talk to the techs. I did and left a message with no reply. So I tried on the MCRat site which he is on, and nothing of a response there either.