Our friends at Roush Performance have just announced that their 2015 Roush Stage 3 Mustang cranks out 670 horsepower and 545 lb-ft of torque thanks to Roush’s new 2015 2.3L TVS supercharger.
The new RS3 Roush Mustang also gets features such as 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 new “R7” aerobody.
Take a look at the full release and dyno graph in the forums.