CSF Porsche 955/957 Cayenne / Audi Q7 / VW Touareg Heavy-Duty Performance RadiatorBrand CSF Part Number 7227 Category Cooling Radiators Condition Brand New Original Manufacturer Packaging The original OE radiator from Porsche is a plastic tank radiator with a single row aluminum core design. While this is generally accepted as good quality and durable, it just isn't enough for the Cayenne. The 955 957 is notorious for having cooling issues. Just driving down the road on a hot day can overheat the engine and off roading and towing