Genuine OEM Audi Secondary Air Pump Connecting Pipe, part number 4N0133771E. This pipe is an integral part of the vehicle's emissions control system, responsible for connecting the secondary air pump to the exhaust system. It facilitates the injection of fresh air into the exhaust stream to aid in catalytic converter warm-up and reduce harmful emissions. Weighing 0.116 kg and measuring 0.47 m in length, this pipe is designed for specific routing and durability. Choosing a genuine OEM pipe ensures the correct material composition, heat resistance, and precise fitment for effective emissions reduction and long-term reliability.