Mugen Low Temp Thermostat Civic 01-05 RSX 02-06 #19301-XK5-00N0. Mugen Genuine Part, Made in Japan.

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: 70°C (STD.: 76~80°C) Full-throttle acceleration temperature: 82°C (STD.: 90°C)

02-06 RSX Base and Type-S (K20A3/K20A2/K20Z1)
02-05 Civic Si (K20A3)
01-05 JDM RSX Type-R DC5
01-05 JDM Civic Type-R EP3
06-11 Civic Si (K20Z3)

Note: Not compatible with K24Ax engines.