MUSTANG GT500 PERFORMANCE

The S550 GT500 comes from the factory with Ford's 5.2L Predator V8 — a flat-plane crank motor with a 2.65L Eaton TVS supercharger bolted on top, rated at 760 HP. That's the baseline. RPT tunes the GT500 on HP Tuners and treats it like what it is: a purpose-built supercharged platform with serious headroom when you feed it the right fuel, the right boost, and a calibration that isn't factory-conservative.

Stage 1 and 2 extract power from the stock blower with a proper tune and supporting mods. Stage 3 pushes the Eaton to its limits with a pulley swap and fuel upgrades. Stage 4 swaps the supercharger entirely for a Whipple 3.0L or 4.5L and turns this into a different animal. Stage 5 is a full build — internals, twin turbos (RPT fab), and a tune built for race fuel or E85.