Mishimoto MMTS-S2K-00L Honda S2000 Racing Thermostat, 2000-2009 Fits the 20002009 Honda S2000 Lower activation temp allows coolant to flow through the engine earlier Maintains lower temperatures and extends engine life Mishimoto Activation: 154.4F (68C) / OEM Activation: 172F (78C) Mishimoto Lifetime Warranty