The Mishimoto Lexus IS300 Racing thermostat will promote greater cooling efficiency throughout your engine. Mishimoto racing thermostats 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.

In our experience, you may need to replace the O-ring that comes attached to the thermostat with a new OEM one instead for fitment on a 2JZGTE