IAG 167 Degree Low Temperature "FA" Thermostat For 2015+ WRX, 2013+ BRZ

For Subaru owners pushing their 2015+ WRX and 2013+ BRZ FA series engine to the limit, the IAG 167 Degree Low Temperature FA Thermostat is a smart upgrade. Unlike the factory thermostat, which doesn’t open until 190.4°F (90°C), this unit starts opening at 167°F (75°C), improving cooling efficiency by allowing coolant to flow earlier. By lowering operating temperatures, it helps prevent heat soak and improves thermal management—ideal for high-performance driving where maintaining optimal engine temps is crucial.

By allowing coolant to circulate earlier, a low-temperature thermostat helps to keep the engine from heating up too quickly. This is a big advantage for engines that see heavy loads, preventing sudden spikes in heat. A cooler engine can also mean better efficiency and less risk of detonation, allowing for stronger, more reliable performance.

The IAG 167 Degree Low Temperature FA Thermostat is engineered for durability, featuring a 430 stainless steel flange to resist corrosion. This direct-fit replacement stands up to demanding conditions and includes the necessary gasket for a secure, leak-free seal to the thermostat housing. Every detail, from the laser-etched finish to the IAG corporate logo is a reflection of the high quality engineering and construction behind this component.