Integrated Engineering TurboSystems Hybrid TurbochargerThe Integrated Engineering TurboSystems Hybrid Turbocharger for the Audi B9 A4 is the keystone of the iE Stage 3 build ecosystem. Designed as an integral component of the complete iE Stage 3 package, this turbo enhances airflow and performance well beyond the factory settings. Unlike other generic options, it works seamlessly with custom calibrations to guarantee impressive results while preserving the daily driving experience the B9 A4 is loved for.