Genuine TRD thermostat for 3rd Gen 3sgte Mr2, celica alltrac Sports thermostat that reduces the coolant temperature of high-performance engines to maximize performance. By reducing the valve temperature by about 10 to 15?C compared with that of a standard thermostat, the TRD sports thermostat increases coolant circulation and reduces performance bottlenecks caused by engine heat, to bring out the best in engine performance. (Maintains valve temperature of 71?C.)