I have a 2013 cab and chassis. I was told by a engineer from GM that it was a detuned pickup engine and it had 40 hp less. does anybody have any idea on getting a tune to raise it to a stock 6.6. he told me I had to go to a dealer that I new that would be willing to change the entire programming on the truck which would entail changing the trucks vin to the one they added to regain the hp . anybody got a any ideas