Mishimoto Racing Thermostat Kit for 2005-2006 Mercedes C Class 2006 CLS Class Racing Thermostat by Mishimoto®. Temperature: 180F. Mishimoto Racing Thermostat will promote greater cooling efficiency throughout your engine. A Mishimoto racing thermostat will significantly lower high engine temperature produced by modified and upgraded turbo applications. Once the engine is fully warmed up the Mishimoto racing thermostat will open up at a lower temperature 158F° F than standard thermostats 180° F (82° C), also allowing the coolant to flow through the engine sooner thus reducing and maintaining cooler engine temperatures.