Supercharger Drive Pulley Upgrade 57.75mm

By reducing the pulley diameter from the factory's ~63.25mm to 57.75mm, the supercharger spins approximately 9.5% faster, leading to a significant increase in horsepower and torque across the entire RPM range. It's important to note that this upgrade is only applicable to superchargers that use a pressed-on pulley. This upgrade requires APR Stage II software, which is sold separately. Additionally, for optimal performance and compatibility, the product is designed for use with APR's S-Tronic TCU Upgrade, specific NGK BKR9EIX spark plugs gapped to .024" +/- .002" and torqued to 30Nm, and a new supercharger belt (ES3219317). The APR Coolant Performance System is highly recommended and required for dual pulley setups to manage intake air temperatures (IATs) below 75c for advertised power figures. A high-flow intake system is also highly recommended to achieve these power figures, and APR suggests removing the intake snow screen for best results. This product is not for sale or use in the state of California on any pollution-controlled vehicle. It is compatible with various Audi models (A7, B8 S4, B8 S5, B8 SQ5, C6 A6, C7 A6, Q5, Q7) and Porsche Cayenne S Hybrid models equipped with the 3.0T engine.