The Edelbrock supercharger Stage 1 Street system part #1580 increases the performance of your 4.6L 3V engine to 466 horsepower and 439 ft-lbs of torque at the crank. The core of this system is the Eaton Gen VI 2300 TVS rotating assembly with a four-lobe design with 160 degrees of twist for maximum flow, minimum temperature rise and quiet operation for excellent drivability. Edelbrock also designed these superchargers with an integrated bypass valve to help eliminate parasitic loss under light throttle, improving mileage potential. Our unique and efficient inlet configuration results in a shorter, less restrictive intake path for improved airflow, without the need for a jack-shaft. Keeping the air cool is a high-capacity air-to-water intercooler and low-temp heat exchanger. The Edelbrock #1580 system is 50-state emissions legal. The supplied tune is intended for completely stock vehicles with the exception of a cat-back exhaust. Requires Edelbrock part #15804 for 2005-2006 Mustang GT applications. Supercharger systems without tuners are not eligible for supplemental warranty and are only emissions-legal when used with the correct Edelbrock program. For safety, the Edelbrock program retains the factory vehicle speed limiter setting.; Calibrations, Tuners, or Programs supplied with supercharger systems are only compatible with vehicles designed for use in the United States or Canada. Edelbrock does not offer calibration support for any vehicle designed for use outside of the United States or Canada.