Performance Thermostat, 68C/155FThe Mishimoto racing thermostat for the 2007 2009 Nissan 350Z will promote greater cooling efficiency for your street or track Z. Mishimoto racing thermostats open at a lower temperature compared to OEM, which allows your vehicle to maintain optimal temperatures even under extreme driving conditions. The Mishimoto racing thermostat provides benefits to your stock or forced induction 350Z and includes our signature lifetime warranty.