Genuine OEM Audi Secondary Air Injection Pump Pipe, part number 4M0133889F. This pipe is an integral part of the secondary air injection system, responsible for transporting air to the exhaust manifold to aid in emissions reduction during cold starts. It ensures efficient air delivery to the system. Weighing 0.0594 kg and measuring approximately 0.315 m in length, it is constructed from durable, heat-resistant plastic. Using a genuine OEM pipe guarantees precise fitment, correct air flow characteristics, and resistance to exhaust temperatures, which is essential for effective emissions control.