Subaru Thermostat - STI 04+ Gates while remaining completely rigid

while remaining completely rigid

It's a drop-in replacement for the factory unit that will stay put and look great doing it

and rapid heat dissipation

the KW Variant 3 coilovers utilize TVC-A (Twin Valve Compression - Adjustable) technology and can increase or decrease the flow of valve to achieve either more or less low speed compression damping

AEM Dryflow Air Filters are washable synthetic air filters designed for an optimum combination of air flow

Subaru Thermostat - STI 04+ Gates while remaining completely rigidCooling System Repair or ReplaceIf your thermostat has failed, it can stick open or stick closed. A thermostat that's stuck closed will result in an overheat that happens after the engine has been running for a few minutes. If it's stuck open, the engine will never reach proper operating temperature. Both can do long term damage to the engine in your 2018 Subaru STI, so contact a Subaru technician.