Mishimoto 03-06 Mercedes Benz E55 AMG 180 Degree Racing ThermostatThe Mishimoto racing thermostat for the 03 06 Mercedes Benz E55 AMG will promote greater cooling efficiency in your stock or modified M113 5. 4L Supercharged engine. Once the engine is fully warmed up, Mishimoto's E55 AMG racing thermostat will open at a lower temperature than standard thermostats. This allows coolant to flow through the engine sooner, which reduces and maintains cooler engine temperatures. The Mishimoto 03 06 E55 AMG racing