The ISR Performance colder thermostat is designed specifically for VQ35HR and VQ37VHR Engines, making it an excellent upgrade for high-performance engines. With an opening temperature of 68 degrees Celsius, compared to the factory standard of 78 degrees Celsius, this thermostat ensures your motor stays cool and prevents excessive heat buildup.

By opening up at a lower temperature, the ISR thermostat allows coolant to flow through the engine sooner, effectively reducing and maintaining cooler engine temperatures. Whether you re looking to optimize engine performance or simply want to ensure your motor operates at an optimal temperature, the ISR Performance colder thermostat is a reliable solution. Keep your engine running smoothly with this high-quality and efficient upgrade.