Owners of 2018-2021 Ford Mustangs who have installed an Edelbrock #15832/158320 Stage I Supercharger Kit can now step up to the next level of performance with the Stage II Supercharger System Upgrade Kit #15883. 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. Included are a 103mm Throttle Body to replace the Stage I 80mm, a high-flow air intake system, a 113mm Mass Airflow Sensor Kit with injection-molded housing, larger 50 lb/hr direct-port fuel injectors along with a Fuel Pump Voltage Regulator, and an 8-rib belt drive to minimize slippage and maintain consistent boost pressure under full throttle.