Owners of 2018-2019 Ford Mustangs who have installed an Edelbrock Stage I Supercharger Kit can now step up to the next level of performance with the Stage II Supercharger System Upgrade Kit. With this Stage II upgrade kit, your vehicle remains emissions-legal in all 50-states while taking full advantage of the improved Gen 3 DI/PI Coyote engine. The Edelbrock Stage II Supercharger Upgrade Kit features all of the vital components required to support the additional horsepower increase that makes this our highest rated horsepower system.