I am ready to add a tuner/programmer now I just need to decide which one is the right one. I am looking for it to help me when I tow as well as when I am empty for gas mileage. I have a 07 5. 9L 3500 Quad Cab the factory exhaust and air intake have been scratched. Now it has an AFE stage 2 air intake, and 4 inch dual Magnaflow exhaust. I am not looking for extreme package just a solid product safe for my towing needs. An eight horse 42 foot gooseneck with 8000 pound axels. Any and all input is appreciated.