Genuine OEM Porsche Air Injection Rubber Hose, part number 99611064971. This hose is part of the secondary air injection system, which introduces air into the exhaust system during cold starts to help burn off uncombusted fuel and reduce emissions. It transports air from the pump or valve to the exhaust ports. Maintaining the integrity of this hose is crucial for proper emissions control and to prevent false air from entering the system. Genuine OEM hoses are made from durable rubber compounds resistant to heat and ozone.