Saleens series IV supercharger kit for the 99-04 4.6 2V Mustang. The series IV uses the Whipple twin screw supercharger unit, the same supercharger that was used on the S281E. The kit is set up for 7 lbs of boost and comes complete with intercooler, intake, heat exchanger, heat exchanger fans, injectors, pulleys, fittings, hoses and all installation hardware. Includes computer reflash from Saleen or can be custom tuned with a Diablo or SCT programmer.