The Mishimoto racing water thermostat promotes greater cooling efficiency throughout your engine. The Mishimoto racing thermostat will significantly lower high engine temperature produced by modified and upgraded turbo applications. The thermostat opens at a temperature 25 degrees F lower than the stock item, also allowing the coolant to flow through the engine sooner thus reducing and maintaining cooler engine temperatures by a corresponding amount. (Coolant temps will end up roughly 25 degrees lower than with a stock thermostat.)

Fits all 2015-2021 WRX