Mustang Roush

Roush Performance, established by former Ford engineer Jack Roush in 1988, had been known for providing performance parts, vehicles and engines. In 2001, the company introduced three packages for the Mustang. Stage 1 came with 17-inch wheels, a lowered suspension and a side-mounted exhaust system. In addition, it came with an air dam, side skirts and a rear spoiler. Stage 2 was an upgraded Stage 1 with 18-inch alloy wheels and BFGoodrich Comp T/A Tires. The suspension was extensively modified with Bilstein shocks, High-rate springs, stiffer anti-roll bars and new control arms. Roush claimed it achieved 1.0g lateral acceleration and was on par with the Porsche 911 Turbo. Both Stage 1 and Stage 2 came with V6 or V8 engine options. The top of the line was the Stage 3, with 360 hp (268 kW) and 375 ft·lbf (508 Nm) of torque. The Stage 3 platform was essentially a heavily modified Mustang GT. The Ford 4.6 L V8 was upgraded with an Eaton supercharger, a new intake manifold, high performing fuel injectors, an air-to-water intercooler and a lighter flywheel (on the manual transmission only). The Stage 3 was available in three packages: Sport, Rally and Premium.

In 2004, Roush released a limited edition mustang known as the 440A. This was a Stage 3 Roush with the addition of custom 440A interior, Roush braking system, and a rear exhaust system instead of the side-mounted exhaust system. The 440A model was released in 2004 to commemorate the 40 years of Ford Mustang production. Only 40 Roush 440A Mustangs were produced and all were sold at a dealership in Florida, USA. Roush also claimed that this model produced 400 horsepower (300 kW), a claim that has been argued by some who claim that the engine was dyno tested at 360 hp (268 kW).

In 2007, now based on an S-197 Mustang, Roush introduced the Sport and 427R editions. The Sport package became the Roush base model, and comes with body kits and high performance exhaust systems. The Stage 1 comes with 18-inch chrome wheels and aggressive tires, a high performance exhaust system, body kits and a vast option menu of visual upgrades. The Stage 2 enhances the Stage 1, by upgrading the stock suspension with high performance front struts, rear shocks, front and rear springs, front and rear sway bars, and Pinion snubbers. The Stage 3 comes with 18-inch, forged chrome wheels and high performance tires, and 14-inch rotors with four-piston calipers. The 4.6 L V8 now has the output of 415 hp (268.4 kW) and 385 ft·lbf (521 Nm) with a Roush supercharger and an air-to-water intercooler. The new top of the line is the 427R, which is based on the Stage 3 Mustang. It produces an additional 115 horsepower (86 kW) and 65 ft·lbf (88 Nm) of torque over the Stage 3 Mustang, due to an upgraded ECM (Electronic Control Module). In addition, it is equipped with an upgraded appearance package.