Mishimoto has developed a racing thermostat engineered specifically for the 2007–2015 CTS-V The Mishimoto CTS-V thermostat fits flawlessly into your stock thermostat housing. It will promote greater cooling efficiency throughout your engine. Mishimoto racing thermostats will significantly lower high engine temperature produced by modified and upgraded engines. Once the engine is fully warmed up the Mishimoto Racing CTS-V thermostat will open up at a lower temperature than the stock thermostat, allowing the coolant to flow through the engine sooner thus reducing and maintaining cooler engine temperatures. And improving long term reliability of your vehicle's cooling components.