Based on the acclaimed ROUSH Stage 3 Mustang, this version is slightly less in content but includes 100 percent of the fun factor. The 427R horsepower package is highlighted by the intercooled ROUSHcharger* system which adds 115 horsepower and 65 lb-ft of torque to the base Ford 4.6L, 3-valve V8 powertrain system. The additional power upgrade comes via a ROUSH-engineered ECM calibration which has been specially-tuned to work in harmony with the different exhaust system used on the vehicle.

Further adding to the style and performance of the 2007 ROUSH 427R is a four-piece aerobody kit which includes a stylized front fascia, front chin spoiler, hood scoop and rear wing and ROUSH 18-inch cast chrome wheels with high-performance tires and the special 427R striping kit.