Ford Racing Supercharger Big Boost Kit converts from 400 Hp to 500 Hp and works with Manual Transmission Only. This Kit Produces 500 Horsepower at 5800 RPM with 93 octane at approximately 11 psi of Boost! The Kit includes Intercooling System, Fuel Pump Kit, and Smaller Pulley, and a Pro-Cal voucher with official Ford Racing Calibration to give your Pony that Boost, that you were hoping to find.