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Reische Performance Thermostat - 170 Degree (11-20 GT, V6, GT350; 12-13 BOSS 302)

Item 397318
AmericanMuscle no longer carries the Reische Performance Thermostat - 170 Degree (11-20 GT, V6, GT350; 12-13 BOSS 302). Please check out 2015-2020 Mustang Radiators, Hoses & Accessories for an updated selection.
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Features, Video & Details

  • Custom Built from OEM Parts
  • Includes OEM diaphragm and Bypass Control
  • Ensures Maximum Cooling Efficiency
  • Direct Replacement Installation
  • Recommended for Tuned Motors, but Tuning Not Required
  • Protects Motor from Damaging Heat
  • Cooler Temps for More Timing Advancement
  • Fits 2011-2020 GT, V6, GT350, '12-'13 BOSS Mustangs

Review & Installation Video

Review & Install Video

This is the Reische Performance 170-degree thermostat for 2011 and newer GT, V6, and GT350 Mustangs, and 2012 to 2013 Boss Mustangs. You're gonna wanna check this out if you're looking for a way to keep engine temps cooler, whether you've done some light modifications or tuning, or some more serious mods. Once you start modding, adding more power, and tuning your Mustang, you're then looking at potentially creating more heat. Over time, and depending on how much more heat you're looking at, you can run into a list of problems, from some very minor things, to some more serious things, like engine wear and detonation. A lower temperature thermostat like this one here can protect your engine from those issues and leave you with a more reliable, better-running car. The install for this is gonna be easy. It's a one-out-of-three wrenches on the difficulty meter, and you can plan on spending an hour getting this installed.The thought process here is that keeping your engine cooler has always been a way to get more longevity out of the car, and open the door to more power. Aftermarket thermostats like this one open sooner, which means that the coolant will circle to the rad sooner, which is then gonna keep the engine temperatures lower. And having a cooler running engine has long been known as a way to avoid detonation in super-charged cars, since it keeps the cylinders cooler.One of the nice things about this thermostat is that it's made with an OEM diaphragm and bypass controller. These are two critical parts of the thermostat that need to be fully functional so that this thermostat can work properly. This isn't a universal unit, it's a direct fit, and the OEM parts guarantee maximum efficiency.Now, customers usually ask about re-tuning to deal with the cooler engine temps and fan timing, and this is something that you're gonna wanna consider. And then again, most of you are probably installing this thermostat on cars that are already getting re-tuned due to the mods that you are or have already added, especially if we're talking about a super-charger. Cooler engine temps mean you can have a more aggressive tune with more timing, without detonation or knock, so overall, more performance.When it comes to price, you can expect to pay about $65 for this thermostat. This is currently the only 170-degree thermostat option on the site, and it's the only one made with OEM parts. You do have the option of going with a 160-degree thermostat from Mishimoto if you wanted to spend a little bit less money.As far as the install goes, this is an easy one. It's a one-out-of-three wrenches on the difficulty meter, and you can plan on spending an hour getting this installed. You will need a new bottle of coolant to top off the system once you're done with the install, and of course, either a jack and jack stands or a lift.You'll remove the plastic underbody work, drain the rad, and remove the intake pipe. Once that's out of the way, you'll have room to get to the thermostat housing. Now, that's held in by two bolts, so you're gonna remove those two bolts and remove the stock thermostat. The new thermostat installs exactly the same way. Just be sure to make sure you're using the O-ring and the gasket that comes with the new thermostat because the stock ones won't work properly with the new one. You're gonna reinstall your intake pipe, and you're ready to refill the coolant system, but don't forget to burp the system and get the air bubbles out. After you check for any leaks, you can reinstall the plastic underbody.That's going to wrap things up for the Reische Performance 170-degree thermostat, but you can always check it out more online, right here at americanmuscle.com.

Protect that Power. If you're adding some bolt-on performance to your mustang, you're adding more heat and power loads. The Reische Performance Thermostat operates at 170 degrees compared to the 180 to 195 degrees of your OEM unit, which allows your motor to run cooler, longer, under higher output. Installing this thermostat is a simple but critical investment in protecting your engine.

Tune it? Cool it. If you're advancing timing on your motor or operating a custom tune, a lower temperature thermostat is a critical investment in engine life. Lower temperatures allow for safer timing advancement and tuning without causing engine wear or detonation, which can ruin your motor.

Made to Fit Mustangs. Unlike cheaper, generic units that are "universal", each Reische Performance Thermostat is made using the same diaphragm and bypass control as OEM thermostats. Each unit is modified by hand with U.S made parts to ensure they run at the right temperature for your Mustang.

All-Weather Capable. Running a lower temperature thermostat has been said to reduce performance – but with the Reische's consistent operation and 170-degree "sweet spot", no drivers have reported any loss of power or MPGs in colder weather.

Application. The 170-Degree Reische Performance Thermostat is specifically designed as a direct replacement-upgrade for all 2011-2020 GT, V6, GT350, and 2012-2013 BOSS Mustangs.

Tuning Note. While no tuning is required for installation, we do highly recommend lowering your fan settings for more consistent coolant temperatures.

Fitment: Details

CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

What's in the Box
  • (1) Thermostat
  • (1) Gasket
  • Coolant Ratio/Additive Recommendations
Installation Info
Will it fit my Mustang?
  • Boss 302 - 12, 13
  • Bullitt - 19, 20
  • GT - 11, 12, 13, 14, 15, 16, 17, 18, 19, 20
  • GT350 - 15, 16, 17, 18, 19, 20
  • GT350R - 15, 16, 17, 18, 19, 20
  • V6 - 11, 12, 13, 14, 15, 16, 17

    Customer Photos (5) Submit Your Photo

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      Questions & Answers (5)

      5 Top Rated Questions

      I’m looking for a thermostat that fits a 2015 2.3L Turbo Ecoboost. Does this fit?

      • The Reische Performance Thermostat will not fit 2.3L Ecoboost engines.

      Helpful (0)

      If I already have a map installed on my ECU with my handheld tuner, all I need to do is drop this in correct?

      • The Reische Performance Thermostat - 170 Degree does not require a tune, however we strongly recommend a tune to accommodate for the lower opening temperature of this thermostat. Any tune you have now would not have this accommodated for unless you specified this with your tuner.

      Helpful (0)

      I have heard complaints that the engine fans don't turn once this part is installed. I am considering buying this along with the Bama x4 tuner. Will the handheld tuner be able to adjust the engine fans or will I have to do that elsewhere?

      • The Reische Performance Thermostat will lower the temperature at which the thermostat opens by approximately 25 degrees, reducing the frequency of the electric cooling fans being commanded on due to lower coolant temperatures and not reaching their on point as often. Cooling fans on/of temps can be adjusted with a tuner, but it is not often recommended as this can push the car into running at temps that are not good for performance.

      Helpful (0)

      This was in one of your buyers comments,Make sure to get a tune to change your fan settings! So what is it(need one or not),Thanks Glenn.

      • If you’re advancing timing on your motor or operating a custom tune, a lower temperature thermostat is a critical investment in engine life. Installing this thermostat without loading a new tune can wear the motor or potentially lead to engine detonation.

      Helpful (0)

      I have Bama tuner,do you need to set the cooling fan with this Thermostat,thanks Glenn

      • You should not need to make any adjustments in order to have a proper installation of the Reische Performance Thermostat. It is designed to be a direct replacement.

      Helpful (0)
      Post Your Question

        Customer Reviews (62) Write a Review

        Overall Rating 4.7

        out of 5 stars

        Installation Time:Less than 1 Hour

        Installation Cost:0-$100

        • Performance Gain 4.209677 4.2
        • Fit 4.967742 5.0



        • 5/5

          Installation Time: Less than 1 Hour

          October 19, 2019

          Nice little mod

          Nice little mod to get your car to run about 10deg cooler than with stock t-stat. Keeps temps a little more in check on track nights. No loss of heater performance when driven below 30deg, heat is adequate.

          Repete

          Year: 2018 Submodel: GT

          Helpful (0)

        • 5/5

          Installation Time: Less than 1 Hour

          August 25, 2019

          170 degree thermostat

          This thermostat is great. I’m from Texas and it’s been 100 degrees here and the head temps don’t go over 200 degrees.. even after doing a couple of WOT pulls. Make sure to get a custom tune for this! Install was very easy.. took just under 10 minutes. Some more coolant is needed due to the loss while changing it out.

          AdrianTarango

          Year: 2014 Submodel: GT

          Helpful (0)

        • 5/5

          Installation Time: Less than 1 Hour

          August 21, 2019

          Works great

          My supercharged 17 5.0 was running the fans on high speed all the time, switching to this thermostat helped a lot. Now I rarely ever see CHT in excess of 195F where before it could get up to 225F. Car runs better and the fans stay quieter. VERY easy install, I just taped a trash bag under the housing to catch the coolant and the swap took about 15 minutes. Must have for forced induction.

          BradB

          Year: 2017 Submodel: GT

          Helpful (1)

        • 5/5

          Installation Time: Less than 1 Hour

          August 15, 2019

          very good part.

          installed in 30 minutes. was very easy and very nice product.

          mygals5HO

          Year: 2017 Submodel: GT

          Helpful (0)

        • 5/5

          Installation Time: Less than 1 Hour

          July 30, 2019

          Cool

          Works well at cooling my engine temps and the car runs smoother in this Texas heat. Went with this over Moshimoto 160 brand as the part seems a more reliable brand.

          Jack

          Year: 2016 Submodel: GT

          Helpful (0)

        • 5/5

          Installation Time: Less than 1 Hour

          July 15, 2019

          170

          works well ..dropped 10 to 12 degrees and dropped IATs a bit also

          JamesT

          Year: 2015 Submodel: GT

          Helpful (0)

        • 5/5

          Installation Time: Less than 1 Hour

          June 11, 2019

          On point

          Didn't know the oem thermostat was 180 degrees should of gone with the 160 but still gets the job done!

          MartinQ

          Year: 2019 Submodel: GT

          Helpful (0)

        • 5/5

          Installation Time: Less than 1 Hour

          May 28, 2019

          Works Great!

          Still haven't changed the fan temps but still noticeably lower temps while moving 80 F ambient air.

          Nick13gt

          Year: 2013 Submodel: GT

          Helpful (0)

        • 3/5

          Installation Time: Less than 1 Hour

          April 03, 2019

          Reische Performance Thermostat

          Product works as advertised. I previously installed a Reische 3 years ago and the rubber material failed, causing coolant to bypass and the motor not to warm up. Hoping the replacement will last longer.

          brightredlt1

          Year: 2015 Submodel: GT

          Helpful (0)

        • 5/5

          Installation Time: Less than 1 Hour

          March 26, 2019

          Works great!

          Definitely well worth the buy if you are looking to lower your engine temp. My temps dropped around 25 degrees from the stock thermostat. I do recommend a tuner to adjust your fan to accommodate the thermostat.

          KeithGT

          Year: 2016 Submodel: GT

          Helpful (1)

        • 5/5

          Installation Time: Less than 1 Hour

          March 15, 2019

          Reische Performance 170 degree thermostat

          Quality you can feel. Easy to install, comes with all you need.

          EdR

          Year: 2017 Submodel: GT

          Helpful (0)

        • 5/5

          Installation Time: Less than 1 Hour

          December 03, 2018

          Works great

          Running way cooler than before. 2.3 TVS on my car. No tune needed.

          OxfordMach1

          Year: 2013 Submodel: GT

          Helpful (1)

        • 5/5

          Installation Time: Less than 1 Hour

          November 23, 2018

          awesome

          works and drop in temps of 10 degrees to about 185, and CHT drops from 214 to 192.

          JakeL

          Year: 2014 Submodel: GT

          Helpful (1)

        • 5/5

          Installation Time: Less than 1 Hour

          October 03, 2018

          Great stat

          Lowered temps 15-18 * well worth it , easy to change

          2018

          Year: 2018 Submodel: GT

          Helpful (3)

        • 5/5

          Installation Time: Less than 1 Hour

          October 01, 2018

          A must for tuned coyote

          works as advertised I highly recommend it along with having your tuner adjust the radiator fan to come on sooner

          Paininthe

          Year: 2011 Submodel: GT

          Helpful (2)

        • 5/5

          Installation Time: Less than 1 Hour

          September 30, 2018

          Work Good

          Work good on a super charged car keep it nice and cool,

          HOOK

          Year: 2014 Submodel: GT

          Helpful (2)

        • 5/5

          Installation Time: Less than 1 Hour

          September 19, 2018

          Does as it says

          Went in easy, does what it does. Pretty sure it's working at 170 degree. I drained the coolant, when I installed my Mishimoto radiator so it was a no brainer to get this part installed at the same time. Unbolted the hose, popped out the old one, you may need a tool to get it out but be careful as to not damage the stock thermostat.

          PaulL

          Year: 2015 Submodel: GT

          Helpful (1)

        • 1/5

          Installation Time: Less than 1 Hour

          September 18, 2018

          Not worth it

          Not that big difference, you wont see the cylinder head temperature 170f at all, it’s almost the same as the stock thermostat, if you really want to see a difference go with 160f it’s even cheaper.

          KhalidA

          Year: 2013 Submodel: GT

          Helpful (3)

        • 5/5

          Installation Time: Less than 1 Hour

          September 04, 2018

          Cool under pressure

          The Reische 170* T-stat works and fits as described. After idling for approximately 30 minutes ECT never went over 185. Highway driving has shown a consistent 10-12 * reduction in both ECT and CHT temps which now range from 180-185 and 190-198 respectively

          JasonP

          Year: 2017 Submodel: GT

          Helpful (3)

        • 5/5

          Installation Time: Less than 1 Hour

          September 02, 2018

          temp is now 13 degrees lower!!

          even though stock stat was 180 in my 14gt this lowered my temp from 198 to 185 according to my sct programmer on a hot day driving around town,and i bought motorcraft orange coolant since that's the only coolant recommended that doesn't cause sludge build up

          Waistedmymoney

          Year: 2014 Submodel: GT

          Helpful (3)

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