ROUSH Performance is excited to announce final horsepower ratings for the all-new 2015 ROUSH Stage 3 Mustang. The RS3 is cranking out a heart-racing 670 horsepower and 545 lb-ft of torque to deliver the ultimate driving experience. All 670 horsepower are created as a direct result of the powerful combination of Ford’s 5.0L V8 engine with ROUSH Performance’s dynamic new 2015 2.3L TVS supercharger. The new ROUSH Mustang’s generous power ratings impeccably compliment the RS3’s list of standard and optional features, including the ROUSH Quad-Tip exhaust (with optional ROUSH Active Exhaust System), standard single-adjustable coilover suspension system (or optional competition-tuned 3-way adjustable system), and the fierce new “R7” aerobody. The 2015 ROUSH Stage 3 Mustang is not just a car – it’s an experience. The RS3 truly bridges the gap between road car and race car, putting drivers behind the wheel of the ultimate uninhibited muscle car. Jack Roush’s vision shines through the 2015 ROUSH Stage 3 Mustang’s perfect combination of 670 horsepower with meticulous handling and braking capabilities, providing the driver access to the robust attitude and performance of a racecar, while maintaining a comfortable and uniquely ROUSH driving experience. Source: Roush