Mishimoto MMTS-350Z-07 Nissan 350Z Racing Thermostat, 2007-2009 Fits the 20072009 Nissan 350Z Activates at lower temperature so coolant flows through system earlier Allows for cooler engine temperatures OEM Activation: 169.7F, 76.5C / Mishimoto Activation: 154.4F, 68C Mishimoto Lifetime Warranty