ROUSH has just announced a new ROUSHcharger (read: supercharger) for the GT500 that's capable of taking the GT500's 5.4-liter V8 all the way up to 700 horsepower with the right combination of mods.

Both the Roush Stage 3 with its Phase 3 package and Ford's factory Shelby GT500 even crest the 650-horsepower mark, with 675 and 662 ponies, respectively. Naturally, someone needed to find out ...

Roush offers supercharger kit for Mustang GT ... same one you'll find strapped to the V8s in the Ford Mustang Shelby GT500 and the C7 Corvette ZR1. The supercharged engine uses an 84 mm pulley ...

Boosting the basic into a beast, the Roush supercharger adds 305 horsepower ... originally packed under the hood of the Mustang Shelby GT500 and is fueled exclusively by premium gasoline.