Genuine OEM Porsche Turbocharger Coolant Return Line, part number 0PB121663C. This line is responsible for returning coolant from the turbocharger back to the engine cooling system, helping to regulate turbocharger temperature. It is part of the engine cooling system. The part weighs 0.276 kg. Genuine OEM parts ensure the correct material and routing for optimal coolant flow and turbocharger longevity.