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Mishimoto Racing Thermostat 154 Degree - Subaru Models (inc. 2002-2014 WRX / 2004+ STI)
Mishimoto Racing Thermostat 154 Degree - Subaru Models (inc. 2002-2014 WRX / 2004+ STI)
Mishimoto Racing Thermostat 154 Degree - Subaru Models (inc. 2002-2014 WRX / 2004+ STI)
Mishimoto Racing Thermostat 154 Degree - Subaru Models (inc. 2002-2014 WRX / 2004+ STI)
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User Media for: Mishimoto Racing Thermostat 154 Degree - Subaru Models (inc. 2002-2014 WRX / 2004+ STI)
User Media for: Mishimoto Racing Thermostat 154 Degree - Subaru Models (inc. 2002-2014 WRX / 2004+ STI)
User Media for: Mishimoto Racing Thermostat 154 Degree - Subaru Models (inc. 2002-2014 WRX / 2004+ STI)
User Media for: Mishimoto Racing Thermostat 154 Degree - Subaru Models (inc. 2002-2014 WRX / 2004+ STI)

Mishimoto Racing Thermostat 154 Degree

Subaru Models (inc. 2002-2014 WRX / 2004+ STI)

Read 17 Reviews | 18 Q&As
Part # MMTS-WRX-01
$48.95
msrp: $60.60

In stock!

Features & Product Details

RallySport Direct is proud to provide you with a large catalog of quality automotive performance and cooling products brought to you by Mishimoto. 

Here, you are looking at the Mishimoto Racing Thermostat. This thermostat has been designed to activate at a lower temperature so that the coolant flows through the system earlier. The result is improved cooling efficiency for better performance. 

 

DETAILS:

  • 154-degree thermostat
  • Activates at a lower temperature so the coolant flows through the system earlier
  • Allows for cooler engine temperatures
  • Direct fitment direct replacement
  •  

     

     

    Specifications

    Brand: Mishimoto
    Gasket Included: Yes
    Opening Point: 154°F
    Mfgr. Warranty: Limited Lifetime
    Condition: New Product
    Return Policy:

    RallySport Guarantee - 30 Days


    Items that are covered under the RallySport Guarantee offer a 30 day no questions asked return policy.

    RallySport Guarantee items may be returned within 30 days of the original invoice date and must include all the original parts and contents for a refund.

    The RallySport Guarantee does not apply to products that have been modified, damaged, misused or abused. All returns require an RMA (Return Merchandise Authorization) Number, and freight charges are strictly non-refundable. For more information regarding our freight refund policy, please refer to our return policy page found HERE.
    RallySport Guarantee

    PEOPLE WHO VIEWED THIS ITEM ALSO VIEWED

    REVIEWS & CUSTOMER MEDIA

    17 Reviews
    3.9 out of 5 Stars
    5 Stars
    (10)
    4 Stars
    (3)
    3 Stars
    (0)
    2 Stars
    (0)
    1 Stars
    (4)
    Customer Photos and Videos
    Mishimoto Racing Thermostat 154 Degree ( Part Number: MMTS-WRX-01)
    Mishimoto Racing Thermostat 154 Degree ( Part Number: MMTS-WRX-01)
    Mishimoto Racing Thermostat 154 Degree ( Part Number: MMTS-WRX-01)
    Mishimoto Racing Thermostat 154 Degree ( Part Number: MMTS-WRX-01)
    1 of 1 people found the following review helpful
    Definitely not worth it 11 months ago
    1out of 5stars

    I bought it originally to replace a stock thermostat. During installation I noticed the currently installed Thermostat was also the 154 degree Mishimoto. I just thought maybe it was a bad one as I didn't know when it was installed. About 4 months later, My car began to overheat again. This time I installed an OEM thermostat. Not worth your time.
      
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    2 of 2 people found the following review helpful
    Part didnot work  1 year ago
    1out of 5stars

    I bought the thermostat and installed into my car with a mishimoto radiator. Two days later the car began overheating and I stopped to let it cool off. Contemplating getting a tow i tried to drive it again and ended up being the thermostat was stuck . The product performed well but lasted a mere 2 days. I reccomend you stick with OEM as this could have cause engine failure in the ej25 motor with the increasing high temperatures, my car saw up to 245 degree coolant temp. I reccomend you do not buy this thermostat.
      
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    20 degrees cooler on my 2002 WRX 1 year ago
    5out of 5stars

    Bought this because i started a new job that requires me to drive my stage 2 bugeye 100 miles a day. The Xline radiator alone brought my temps down about 10 degrees from 195 to 185 and now with the thermostat im running about 20 degrees cooler at 165. I wasnt able to use the gasket thats included because i couldnt get it to seat properly so i had to re use the oem subaru gasket but its okay because i only put it in two months ago. Today it also threw the P0128 code on the way home so i might try and alter the water temp scaling. Great product overall i feel much more confident driving this thing 100 miles a day.
      
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    Mishimoto Thermostat keeping your engine cool 2 years ago
    5out of 5stars

    Recieved the product and was impressed how well packaged it was and how it was ready to install. Quick and easy install and works awesome. Car gets max 208* and when I am running it hard in boost, it runs down to 158*. Of course I installed it in the winter so others may experience it differently. I would recoomend this thermostat to anyone building a performance Subaru.
      
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    1 of 1 people found the following review helpful
    Thermostat 3 years ago
    5out of 5stars

    Installed on a '07 STI. I'm also using the Mishimoto aluminium radiator. I installed this in the winter and when cruising on highway, my temp was around 160 degrees F. I would only use this during the warm months and use oem during the winter because it's way under operating temp.
      
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    QUESTIONS & ANSWERS

    • Q: PO128?  bug eye bob 1 year ago

      I was wondering if running this thermostat could throw a PO128 coolant code as the car wouldn't hit ideal running temps soon enough on a cold winter night or just a cold start
      • 0 of 0 people found the following answer helpful

        A:  Yes this can cause that code to be thrown, these arent recommended if you live in a cold climate or somewhere where freezing or below freezing temps are normal.

        Tylo R @ RallySport Direct
          
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    • Q: OEM vs Mishimoto Racing Terhmostat  Chair1 year ago

      I daily drive a 2013 WRX with a Stage 2+ SF OTS tune from Cobb. I have a short ram intake, COBB downpipe, with Invidia cat back exhaust. I just installed the Mishimoto X-Line Radiator and Racing Thermostat. Should I reinstall the OEM thermostat now that I'm getting P0128 check engine code?
      • 0 of 0 people found the following answer helpful

        A:  I have the same issue. I installed a CSF radiator and this thermostat and I keep getting the P0128 error code. I dont know if I should be concerned. Maybe the combo is working too well... I keep resetting my ECU to get rid of the code but it will pop up every few days... anyone else have any input? Do I need to be worried?

        Hoang Nguyen
          
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    • Q: Temperature   Jamesg1 year ago

      My car runs at about 205 degrees average in Florida summer weather and peaks at 218 would this thermostat helpb to decrease temperatures ?
      • 0 of 0 people found the following answer helpful

        A:  Yes, this thermostat will open earlier than stock. That said, a larger radiator, coolant additive such as Redline Water Wetter, and burping the cooling system would also be good steps to take.

        Marcus E. @ RallySport Direct 1 year ago  
          
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    • Q: Mishimoto racing thermostat 154Degree correct use   Henry 2 years ago

      So the model in question is USDM EJ257 with big Mishimoto radiator, I want to know if use original thermostat has some problem or is totally necessary use Mishimoto racing thermostat 154Degree
    • Q: Big radiator with thermostat   Henry 2 years ago

      Hello I need to know if is necessary used different thermostat when use a big radiator in subaru sti ej257
      • 0 of 1 people found the following answer helpful

        A:  Unfortunately, we would not be able to confirm fitment for JDM models

        Devan M. @ RallySport Direct 2 years ago  
          
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      • 0 of 0 people found the following answer helpful

        A:  So the model in question is USDM EJ257 with big Mishimoto radiator, I want to know if use original thermostat has some problem or is totally necessary use Mishimoto racing thermostat 154Degree

        Henry @
          
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