Roush has quietly unveiled their new tuning packages for the 2013 Ford Mustang.Starting with the Stage 1 package, the tuner installs an aerodynamic body kit with a front splitter, a revised grille and a hood scoop. There's also a rear spoiler, extended side skirts and a rear diffuser insert. The Stage 2 package adds a sport-tuned suspension with new springs, twin-tube shocks and a larger front stabilizer bar. There's also 18-inch aluminum wheels wrapped in Cooper RS3 high-performance tires. Lastly, the Stage 3 Mustang includes all the aforementioned equipment as well as a supercharged 5.0-liter V8 engine with 565 hp (421 kW / 573 PS) and 505 lb-ft (683 Nm) of torque. Inside, the cabin has unique instrumentation, embroidered floor mats and special badging. The 2013 Roush Mustangs will start arriving at dealerships later this month and they will have a 3-year/36,000-mile bumper-to-bumper warranty.