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Mishimoto Racing Thermostat
The Mishimoto racing thermostat for the 2015 STI will promote greater cooling efficiency throughout your engine. The Mishimoto racing thermostat will significantly lower high engine temperature produced by modified and upgraded turbo applications. Once the engine is fully warmed up the Mishimoto racing thermostat will open up at a lower temperature than standard thermostats, also allowing the coolant to flow through the engine sooner thus reducing and maintaining cooler engine temperatures.
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Mishimoto Racing Thermostat / MMTS-WRX-01 Fits
2 customer reviews
Works on hot weather
For my EU Spec 2018 STI works great (no check engine light)! I live where temperatures are all year long 24ºC (75ºF) lowest to 38ºC (100ºF) heights and moreover since I drive on heavy traffic most of the time.I recommend it for hot weather temperature
Definitely does the job, engine runs much cooler. You might get a check engine light though, P0128, so you will have to adjust the ECU to account for the cooler temps. Only reason I gave 3 of 5 for ease, it can be a bit messy.