IAG Performance Low Temperature Thermostat 156 Degree 2002-2014 WRX / 2004-2021 STI Must Have

Description

For Subaru owners pushing their 2002-2014 WRX or 2004-2021 STI EJ series engines to the limit, the IAG 156 Degree Low Temperature EJ Thermostat is an excellent upgrade. Unlike the factory thermostat, which doesn’t open until 172.4°F (78°C), this thermostat begins opening at 156°F (69°C), improving cooling efficiency by allowing coolant to circulate sooner.

By enabling earlier coolant flow, the low-temperature thermostat helps prevent the engine from heating up too quickly, a key benefit for engines under heavy loads. Maintaining a cooler engine reduces the risk of detonation, improves efficiency, and supports stronger, more reliable performance under demanding conditions.

The IAG 156 Degree Low Temperature EJ Thermostat is engineered for durability with a 304 stainless steel body that resists corrosion. This direct-fit replacement includes the necessary gasket for a secure, leak-free seal to the thermostat housing. From the laser-etched finish to the IAG logo, every detail reflects the high-quality engineering and construction behind this component.