Whipple Supercharger Stage 1 to Stage 2 Upgrade Kit (S650 Mustang) Take your Whipple Supercharged S650 Mustang to the next level of performance with the Stage 1 to Stage 2 Upgrade Kit. Engineered for enthusiasts ready to extract every ounce of power from their setup, this package delivers everything needed to transform your Mustang from an already impressive performer into a track-dominating powerhouse. This comprehensive bolt-on upgrade includes a 3.75" billet supercharger pulley, 112mm billet throttle body, 120mm high-flow inlet tube, and a revised performance calibration designed to push your Whipple setup to new heights. The result? A jump from 810 horsepower and 640 lb-ft of torque to an incredible 875 horsepower and 650 lb-ft of torque (flywheel), when using premium 93-octane fuel under optimal conditions. With improved airflow, increased boost, and updated tuning parameters, this kit maximizes efficiency and responsiveness—delivering unmatched Whipple performance and reliability. *Power is under optimal conditions with 93 octane fuel. Results may vary due to conditions, octane and dyno type. **Calibration only supplied, Tomahawk Flash Tool can be reused (with same VIN#)