CSF Racing High-Performance Auxiliary RadiatorMercedes AMG GT R GT C High Performance Auxiliary Radiator The High Performance All Aluminium Auxiliary Radiators work in conjunction with the rest of the cooling system to reduce temperatures throughout. This is critical as the Auxiliary Radiators not only help keep engine water temperatures lower, but also are utilized as the heat exchange medium in the air to water charge air coolers for the turbocharger system to reduce intake air temperatures