A stock Ford 4.6 liter with a three-valve V8 powerplant received a major revamp by the Roush guys — replacing most of the internal parts with much stronger versions including the aluminum piston with increased dish, lowering the compression ratio. Steel fabricated crankshaft and connecting rods were added, with the output reinforced by a Roush supercharger. An improved high-capacity fuel-delivery system and an upgraded clutch were also added. Roush equipped it with its Stage 3T suspension for better cornering and handling. As for the external parts, it features a six-piece aero body kit that suggests the various metals used on the WWII fighter planes. The checkerboard design pays homage to the pilots of the 357th Fighters Group, Eighth Air Force.

Its forerunner, the Roush P-51A Mustang, was revealed at the 2007 SEMA Show. Improvements were added soon after its debut, including the six-piston brakes, painted on stripes, rear deck lid black-out panel, and new black chrome wheels, all of which brought out the new Roush P-51B.

Roush CEO, Jack Roush said that the 2009 Roush P-51B is closest automobile that can compete with the performance of real fighter planes. It’s Ford²!