The Mishimoto racing thermostat for the 1986 - 1992 Toyota Supra 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.Opening at a lower temperature allows the coolant to flow through the engine sooner thus reducing and maintaining cooler engine temperatures.