



🌡️ Stay cool, drive hotter — the ultimate Subaru WRX/STI thermostat upgrade!
The Mishimoto MMTS-WRX-01 Racing Thermostat is engineered for Subaru WRX and STI models from 2001 to 2017, activating coolant flow at a lower 154°F to maintain optimal engine temperatures. Its lightweight aluminum construction ensures durability without added weight, while the precise fit guarantees easy installation. Designed to extend engine life and backed by a lifetime warranty, this thermostat is the must-have upgrade for performance-focused Subaru enthusiasts.










| Brand | Mishimoto |
| Model Name | MMTS-WRX-01 |
| Special Feature | Lower Activation Temperature |
| Color | Mmts-wrx-01 |
| Specific Uses For Product | Improving engine cooling and temperature management in Subaru WRX and STI vehicles |
| Temperature Control Type | Manual Cooling |
| Included Components | Thermostats Auto |
| Power Source | Battery Powered |
| Item Weight | 0.04 Kilograms |
| Material | Aluminum |
| Shape | Cylindrical |
| Control Type | Button Control or Dial Control |
| Control Method | Touch |
| Style | Racing |
| Backlight | No |
| Specification Met | ISO 9001, ISO 14001 |
| UPC | 748354800128 |
| Global Trade Identification Number | 00748354800128 |
| Manufacturer | Mishimoto |
| Item Weight | 1.44 ounces |
| Product Dimensions | 7.62 x 7.62 x 7.62 inches |
| Item model number | MMTS-WRX-01 |
| Is Discontinued By Manufacturer | No |
| Exterior | Painted |
| Manufacturer Part Number | MMTS-WRX-01 |
| OEM Part Number | MMTS-WRX-01 |
| Special Features | Lower Activation Temperature |
D**N
Easy, cold!
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.
J**D
Good Parts
Parts at good
A**E
Not an OEM replacement!
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.
H**A
Runs really cool
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 :(
J**J
Fit well in my 2003 Subaru impreza wrx.
The media could not be loaded. Fit well in my 2003 Subaru impreza wrx.
G**O
A+++
Good construction, exactly as describe, thermostat is working great, keeping the temperature under the normal parameters. Great upgrade for any car.
S**O
Great product for built subaru
Works great and installed just the same as OEM replacement. have yet to see temperatures reach that of OEM thermostat even on hot track days. Works better with mishimoto radiator and fans! would not recommend on stock subaru as it will take a long time to reach operating temperatures.
J**B
Do some research before getting this
Fits 15 sti but They should advertise that you will probably need a tune adjustment.. Kept throwing code p0128 for not reaching operating temp fast enough. Also to be clear your car will not run cooler as it still gets up to factory operating temp just takes longer to get there. Might be beneficial for track cars but for my daily even in Texas summer was not worth the hassle
TrustPilot
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