Owners of 2018-2020 Ford Mustangs who have installed an Edelbrock #15832/158320 Stage I Supercharger Kit can step up to the next level of performance with the Stage II Supercharger System Upgrade Kit (part #15883). With this upgrade, your vehicle remains emissions-legal in all 50 states while taking full advantage of the improved Gen 3 DI/PI Coyote engine. The kit includes all of the components required to support the additional horsepower: 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 with a Fuel Pump Voltage Regulator, and an 8-rib belt drive to minimize slippage and maintain consistent boost pressure under full throttle.