I'm very close to ordering an Xcalibrator 2. They clam 17 rwhp on a stock GT, could I expect that or more? Would it be worth getting? I have some big future mods like cams, 4.10 gears, and a port & polish.
Do it! But go through MPH, not americanmuslce (previously mustangtuning). I got mine from there and didn't like the tune at all. Stick with Tim @MPH, you won't be sorry.