I had a 2004 GMC 3500 6.6 duramax and had purchased the Edge programmer W/ the ECU. I had the truck for roughly 2 years before the turck was wrecked in the rear. I have since sold the truck and have no use for the tuner any more. The tuner is the easiest thing to install and bolts right on the the factory ECU harness plugs. The tuner was pretty sweet and gave me almost 29psi w/ just a K & N filter and the rest was bone stock! I'm posting the edge website below in case you need tech specs. I'm only asking $325 for the tuner shipped to your door. The controller and wiring are not that big so it should fit into the USPS flate rate box w/o a problem. E-mail me or call me 305-965-1529 if you have any questions.