ISR Performance Nissan 350Z/370Z and Infiniti G37 with VQ35HR & VQ37VHR thermostat without water port - 68 Degree Celsius 

ISR Performance colder thermostat for VQ35HR and VQ37VHR Engines. Good upgrade for High performance engines, The ISR units opens at 68 deg celsius( 154.4 degree in fahrenheit) compared to factory 78 deg celsius. Cool down your motor before heat builds up Perfect for the blazing arizona heat during the summer.

Once the engine is fully warmed up the ISR thermostat will open up at a lower temperature than standard thermostats, also allowing the coolant to flow through the engine sooner thus reducing and maintaining cooler engine temperatures.

** All ISR Performance Products are Designed for Off Road Use Only **