Owners of 2015-2017 Ford Mustangs who have already installed an Edelbrock Stage 1 Supercharger Kit #15838 but want to add even more power can now step up to the next level of performance with the Stage 2 Supercharger Upgrade Kit #15884. With this Stage 2 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 2 Supercharger Upgrade Kit features all of the vital components required to support the additional horsepower increase that makes this one of Edelbrock's highest rated horsepower systems. Included are a 103mm Throttle Body to replace the 80mm Stage 1 unit, a high-flow air intake system, a 113mm Mass Airflow Sensor Kit with injection-molded housing, larger 78 lb/hr direct-port fuel injectors, and a drop-in 400 LPH fuel pump assembly. Installing the Stage 2 Upgrade Kit does not require removal of the Stage 1 supercharger.