Integrated Engineering Supercharger Pulley UpgradeThe IE supercharger pulley for late 4 bolt style 3. 0T V6 Audi engines extracts more power from your supercharger by spinning the unit 7% faster than stock, resulting in higher boost levels. Paired with a Stage 2 Tune, you can expect gains over 25 horsepower on pump fuel. The IE 4 Bolt Style Supercharger Pulley is designed for many late model Audi 3. 0T Supercharged engines that use the non press fit updated bolt on style of supercharger pulley found