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Reische Performance Thermostat - 170 Degree (96-04 GT; 07-10 GT)

Market Price $43.99 You Save 16% ($6.99)
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  • Item 397316
  • MPN# Ford-4S

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    Features & 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 1996-2004 and 2007-2010 GT Mustangs
    Performance Protection. Adding bolt-on power can quickly turn the heat up on your motor, which can kill performance and cause more wear. The Reische Performance Thermostat operates at 170 degrees compared to the 180 to 195 degrees of your OEM unit. This lower temperature threshold ensures your motor runs cooler under more power loads, and makes for a simple but critical investment.

    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 1996-2004 and 2007-2010 GT Mustangs.

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

    Fitment: 1996 1997 1998 1999 2000 2001 2002 2003 2004 2007 2008 2009 2010 Details

    What's in the Box
    • (1) Thermostat
    • (1) Gasket
    • Coolant Ratio/Additive Recommendations
    Installation Info
    Will it fit my Mustang?

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    3 Questions / 3 Answers

    Ask a Question

    Should I get an AM tune revision if using this 170 degree thermostat?

    SeanD

    • The Reische Performance Thermostat - 170 Degree does not require a tune for proper functionality, however, since your motor will run cooler, you will be able advance the timing a little more if you were to get a tune.

      AMJEFF

    Helpful (1)

    Is it a must to adjust the fan? The weather in my country reachs 120f at summer. I have a custom tune on my mustang and the fan low speed runs at 188f and shuts at 182f. While the high speed runs at 198f and shuts at 192f. My tuner had told me that if he would adjust the fan following the products instructions the fan may not turn off while the car is running. Now if it possible to apply the 170f thermostat while keeping my fans timings the same?

    AliA

    • The Reische Performance Thermostat will not alter the temperatures which the cooling fans turn on/off.

      AMJEFF

    Helpful (0)

    I live in Orlando Florida and it gets extremely hot in the summer. Can I use this on my stock 98 GT just to help it keep cool in traffic? Would it be bad or harmful to use it on my stock 4.6?

    AlanV

    • The Reische Performance Thermostat can be used on your stock 1998 GT with no ill effects to your car. This will help reduce coolant temperatures.

      Rob D

    Helpful (0)

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    Customer Reviews (19) Write a Review

    Overall Rating 4.8

    out of 5 stars

    Installation Time:Less than 1 Hour

    Installation Cost:$100-$250

    • Performance Gain 4.157895 4.2
    • Fit 4.947369 4.9



    • 3/5

      Installation Time: Less than 1 Hour

      July 05, 2018

      It works, but it didn't fix my problem.

      The fit was absolutely perfect. However, I have been having an overheating problem which goes beyond the thermostat. The reason why I gave this thermostat a 3 instead of a five was the price. After receiving it I honestly couldn't tell the difference between this one and a much cheaper 10 dollar orielly one. The thermostat didn't look any shinier or more performance built. Basically After I got it I was thinking, dang I should've just gone to oreillys and picked up the same thing for 10 bucks instead of 40

      JorinH

      Year: 1996 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Less than 1 Hour

      April 30, 2018

      Works as intended

      Keeps temps nice and cool. Expect your heater to not work quite as well as before though.

      Teej

      Year: 2002 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Less than 1 Hour

      March 12, 2018

      Keeps temps right at 170!

      This thermostat did its job perfectly, but I noticed that my 96 Vortech Supercharged Mustang with forged pistons ran better with the stock (192) thermostat installed. So I swapped it back out.

      NicB

      Year: 1996 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Less than 1 Hour

      January 03, 2018

      Just right

      Originally had the mishimoto racing thermostat which kept my engine actually too cold, especially during fall/winter where the engine wouldn't get into close loop and would throw a code. This Reische 170 Thermo is perfect. No issues even in winter right now. Runs colder than OEM still but not too much like the mishimoto.

      Eneme

      Year: 2002 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Less than 1 Hour

      November 27, 2017

      Great thermostat

      Real quick and easy install!! Keeps temps down even in the heat!! Great value buy!!

      AndrewS

      Year: 2003 Submodel: GT

      Helpful (2)

    • 4/5

      Installation Time: Less than 1 Hour

      November 11, 2017

      Kept ECT much cooler

      Product was great. ECT's went from 200 to 170's immediately.

      DamionB

      Year: 2000 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Less than 1 Hour

      September 24, 2017

      Great product

      Works great at keeping the car running cooler. Easy installation and tuning instructions.

      dpcc1971

      Year: 2000 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $100-$250

      August 03, 2017

      Great for tuned engines

      I have a number of bolt-on performance modifications, and run 93 Octane. My performance would dip as the engine would get to higher temperatures. After installing it, I don't get above 192f and have not experienced the performance dip with the stock thermostat. The box came with instructions on what the low speed fan and high speed fan temperatures needed to be set to. I was able to manually modify the settings on my Bama tune via the iTSX application. I'm really impressed with the sheet they included with the hardware for changing your tune.

      MinnesotaGTfan

      Year: 2008 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Afternoon

      August 01, 2017

      Reische Thermostat

      Keeps engine temperature noticeably lower. Combine that with a tune to turn fan ON sooner great combo to keep engine Cool. Definetly better than the OEM !

      Torch

      Year: 2008 Submodel: GT

      Helpful (1)

    • 5/5

      July 27, 2017

      Cool Thermostat

      My car runs a lot cooler. I was buying the less expensive thermo. Not anymore. Thanx for a great product.

      DavidM

      Year: 1997 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Less than 1 Hour

      July 25, 2017

      Perfect

      Fits like a glove easy to install. My gt is running cool

      RonaldJ

      Year: 1998 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Less than 1 Hour

      July 24, 2017

      Runs a lot cooler!

      Engine temp was running 204 with stock thermostat. This thermostat hasn't exceeded 186. I'm very satisfied. Just make sure you tune your fan to come on at around 179.

      GhostRidah

      Year: 2003 Submodel: GT

      Helpful (1)

    • 4/5

      Installation Time: Less than 1 Hour

      July 10, 2017

      Quality product

      As far as quality goes it seems to be made from good durable material and should be very dependable and have a very long life without any issues. As for as "performance" goes though, I see zero difference temperature wise. I don't know off the top of my head what an OEM thermostat runs price wise, but if it's only 5 bucks or so difference then I'd recommend buying but $10 then I'd just go with an OEM one. Hope this was helpful. Thanks.

      JohnnyMach1

      Year: 2003 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Less than 1 Hour

      June 23, 2017

      Thermostat

      Perfect fit!! Easy install!! Done in 20 minutes including removing some coolant and replacing when done!

      AlanV

      Year: 1998 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Less than 1 Hour

      April 26, 2017

      Great value buy!!!

      My stang hovers around 172 now, thanks to this thermostat. Even better performance after my tune revision. Thanks American muscle!!!

      AndrewS

      Year: 2003 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Afternoon

      March 06, 2017

      works great!!!!

      Definitely keeps cooler I haven't had my water even make it to 180° yet. I did get a tune revision and have noticed greater muscle under the hood.

      speedfreak89

      Year: 2010 Submodel: GT

      Helpful (4)

    • 5/5

      Installation Time: Less than 1 Hour

      February 21, 2017

      Keeps temps at perfect level for coolant!

      City driving keeps temps around 182-188f. Performance driving I never see coolant go above 192f even after an hour hill climb race. No performance negatives, car does not run lean or rich. Make sure to follow instructions on temps to input into your tuners for fan off and on temps.

      2008Muttstang

      Year: 2008 Submodel: GT

      Helpful (4)

    • 5/5

      Installation Time: Afternoon

      January 11, 2017

      Great!

      Tighter fit but definitely helps out! Seems sturdy and still hasn't caused a issue yet but definitely recommend if you need one!

      Ruck

      Year: 2001 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Less than 1 Hour

      January 10, 2017

      Best bang

      Best bang for buck get a colder thermostat Never even gets close to hot Great for everyday and track use

      JULIAN

      Year: 1989 Submodel: GT

      Helpful (3)

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