Supercool Low Temp High Flow Thermostat EJ20 / EJ25The Fuji Racing Supercool Thermostat has been in testing for most of 2022, now we are finally ready to release it to the public. With the Fuji Racing Supercool thermostat in place, your engine coolant is allowed to circulate around the engine much earlier which allows overall engine temperatures to be reduced sooner than they would normally occur. Your coolants job is to carry heat out of the engine, take it through your radiator, and then flow it