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Roush Performancewww.roushperformance.com800/597-6874With one of the winningest names in racing, Roush Performance has used its on-track success to design and manufacture quality performance parts for the street. The Roushcharger is a great way to add power and the Roush heritage to your Mustang. The main component of this kit is the Roush M90 Roots-type supercharger, which produces 5 pounds of boost out of the box. The kit also includes an air-to-water intercooler system, high-flow fuel injectors, and an air-induction system. The '10 Roushcharger kit raises horsepower to 435 flywheel horsepower and 400 lb-ft of torque, seriously boosting the fun factor when you hit the loud pedal. The Roushcharger is 50-state legal and is even covered under the 3-year/36,000-mile factory warranty. Roush also offers a TVS version for the Three-Valve engine-we've driven one deep into the 10s on a street-legal GT.