Mishimoto MMTS-RSX-02 Acura RSX Racing Thermostat, 2002-2006 Fits the 20022006 Acura RSX Lower activation temp allows coolant to flow through the engine earlier Maintains lower temperatures and extends engine life Mishimoto Activation: 140F (60C) / OEM Activation: 172.4F (78C) Mishimoto Lifetime Warranty