A thermostat sits between the engine and the radiator. Its works by blocking the flow of coolant to your radiator until the engine has warmed up. When your engine is cold, no coolant flows through the engine. Once your engine reaches around 200 degrees F, the thermostat will open and allow coolant to begin flowing. A high performance engine runs much hotter than those from the factory. The high pressure and stress throughout your system could easily be too much for a factory thermostat to handle. A high performance thermostat will handle the high temperatures, and allow the proper flow of coolant through your system to keep your engine safe. While shopping our large inventory you will find a wide selection of 160 degree, 180 degree, and 195 degree thermostats. We also carry a selection of OE replacement thermostats. If you have any questions about thermostats for your vehicle , reach out to one of our experienced representatives and we will help you make a more informative decision.