Termostat Mishimoto Subaru WRX 2001-2014 STI 2001-2021 68C/155F - MMTS-WRX-01 - The Mishimoto racing thermostat for the Subaru WRX 2001–2014 / STI 2001–2016 will promote greater cooling efficiency throughout your engine. The 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 than standard thermostats, also allowing the coolant to flow through the engine sooner thus reducing and maintaining cooler engine temperatures. Fits the 2001-2014 Subaru WRX & 2001-2016 Subaru STI Lower activation temp allows coolant to flow through the engine earlier Maintains lower temperatures and extends engine life Mishimoto Activation: 154°F (68°C) / OEM Activation: 170°F (76.5°C)Mishimoto Lifetime Warranty