Mishimoto MMTS-WRX-01 Racing Thermostat Compatible With Subaru Impreza WRX/STI 2001-2017

Its a great product for helping to loer engine temperature,

decrease engine temp but u will get a check engine light

Parts at good

Installed very easily, has the WRX running nice and cool so far. Watched 3 cars overheat in a traffic jam, I didn't even get up to the mid point. Add: After about 3 months of having this installed, I have an additional piece of info to add. I would only recommend this for racing applications. For a daily driver I am having an issue with it tripping a CEL coding as engine collant temp too low. Alone it may be fine, but when paired with the grimspeed radiator it prevents the car from reaching correct operating temp in normal driving, especially highway with fairly low ambient temps (57 or so). Just a little extra info for those of you considering it. It still works exactly as it should, just not right for my application.

Fits as it should and works as designed, however, it opens at a lower temp than OEM, resulting in check engine lights for the engine not warning properly. Might be good if you're racing, but not if you're stock.

This is a great piece of hardware. Word of caution though, unless your subie is modified & (or) will not throw cooling temp error P0128, this will work best; else use oem. On a personal note, I'm bummed I couldn't keep it - even tried to find a way to edit canbus :(