CSF Porsche Race Central Auxiliary Radiator (991 911 Carrera, 981 Cayman/Boxster)CSF Race Radiator for Porsche 991. 1 911 Carrera, 981 Cayman Boxster aux. Centre Radiator Porsche water radiators are notorious for their unreliability, experiencing issues with failure due to puncture and rotting. Typically, your Porsche will require new radiators every 5 7 years. Not only do these CSF Radiators dramatically improve cooling efficiency (whilst maintaining light!) they also come with a lifetime warranty. Perfect for your Porsche! CSF