I sold my sct when I had my headgaskets replaced a year ago or so. They reflashed the truck and ficm it says on a tag on the radiator support. Since the reflash my mileage has went from 16-17 to 12-13. I just purchased a used Xcal 2 from a guy with a 2004 model. When it gets here would it be possible to load his stock tune off it and use it for the base in my truck? Also would this screw up the ficm calibration since the dealer tag says they reflashed both of them when they did the gaskets. I think it would be as simple as plugging in the tuner when it gets here and loading a tune then switching it back to stock. That should put his stock tune on the truck as long as I don't plug it in to my computer and unlock his stock tune. I could be way off here.