Well I ordered it tonight and will let you guys know what I think when I get it all dialed in. The biggest improvement that I have been reading is the sluggish auto gets much more crisper and quicker. There has been multiple HP or TQ increases that I'm reading but it seems like more guys are racing these trucks and commenting. I did find one a few sources that have a 2500 series trucks and have enjoyed towing more since the tune. These LS engine have so much potential. I know a cam really can change the power output, but no plans for that. Anyway I don't want the speed, I got a other options for driving if that was the case.