The Mishimoto racing thermostat for the Subaru WRX 2001–2014 / STI 2001–2019 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.
Excellent product, way above oem, I have purchased this product with all of my vehicles, and the normal operating temperature has decreased in all of my vehicles to an average of 15 degrees! I strongly recommend this thermostat!