Roush220150526ROUSH Performance is excited to announce the final horsepower ratings for the all-new 2015 ROUSH Stage 3 (RS3) Mustang. The RS3 cranks out a heart-racing 670 hp and 545 lb-ft of torque to deliver the ultimate driving experience.

All the 670 hp are created as a direct result of the powerful combination of Ford’s 5.0-liter V8 engine with ROUSH Performance’s dynamic new 2015 2.3L TVS supercharger.

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