Genuine OEM Audi Exhaust Gas Turbocharger, part number 079145721. This water-cooled turbocharger is designed to significantly increase engine power by forcing compressed air into the combustion chambers, improving performance and efficiency. It is a complex assembly requiring precise manufacturing and balancing. Genuine OEM turbochargers are built to exact specifications, ensuring optimal performance, durability, and proper integration with the engine's cooling and lubrication systems.