This thermostat has the operating temperature set lower than normal. It prevents engine power loss by minimizing rapid water-temperature rises under harsh conditions such as during circuit driving. The use of a flow-control-type valve prevents hunting, thereby achieving rapid stabilization of the water temperature (the engine warms up within a short period). Operating temperature: 68°C (STD.: 76~80°C) Full-throttle acceleration temperature: 81°C (STD.: 90°C) Vehicle & Engine applications: 02-06 RSX base and Type-S (K20A3/K20A2/K20Z1)02-05 Civic Si (K20A3)01-05 JDM RSX Type-R DC501-05 JDM Civic Type-R EP306-11 Civic Si (K20Z3)Note: Not compatible with K24Ax engines