The Mishimoto racing thermostat for the 07-11 Mercedes Benz E63 AMG will promote greater cooling efficiency in your stock or modified M156 engine. Once the engine is fully warmed up, Mishimoto's E63 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 07-11 E63 AMG racing thermostat is the perfect addition to your street or track AMG and is a direct replacement for the stock thermostat. This thermostat includes the signature Mishimoto Lifetime Warranty.