90-HP Bolt-On! This kit will increase the horsepower on your stock 5.4L DOHC engine from 500HP to 605HP! Ford has developed these kits to include everything you need to add this reliable HP and torque upgrade. Kits feature a 2.3L Twin Corices Series Eaton supercharger with 4-lobe 160 degree twist rotors. Includes an open element cold air intake to provide a cool, dense intake charge for optimum power. Pro-Cal tool voucher is included for due to multiple calibrations. Note: Must use premium fuel.