Ford approved supercharger, better heads and cams. A tuner will have to be removed for weeks to erase it's digital tracks if you have to take it in. A 50 shot sneaky pete nitrous system that can be easily hidden and removed if necessary. 3:73 or 4:10 gears will get you off the line. Things that will free up the horsepower you have already, Ram air intake, Electric fan in place of mechanical if not equipped already, lighter rims, aluminum drive shaft, weight reduction: lose the spare tire....ect.