The Edelbrock Stage II Upgrade Kit allows customers using the 1580 supercharger (2005-2009 4.6L Mustang) to upgrade to stage 2. The Edelbrock Stage II Upgrade Kit includes a 3.25” supercharger pulley, complete competition air intake system, GT500 fuel pump, injectors w/ adapters, Gatorback belt, and an updated calibration file. This upgrade is intended for racing/off road applications
