Reische Performance Thermostat Performance 170 Degree Mustang V6 2011-2017/ Boss 302 2012-2013/ GT 2011-2022/ Shelby GT350/R 2015-2020

This Reische 170° thermostat is custom made with the same size diaphragm and bypass control as the OEM units. This provides proper bypass control, which means maximum efficiency from your Mustang's cooling system. Each of these thermostats is carefully modified by hand, using the only U.S. made parts and then quality inspected to ensure reliable and consistent opening temperatures. This Reische Performance 170 Degree Thermostat is a direct replacement for the old, standard-issue thermostats in your late-model Mustang.

This Reische Performance Thermostat is intended to be used in vehicles that are running a custom tune. It is important that the fan settings in your tune are set up properly if you want to see the best possible heat dissipation from your cooling system. Otherwise, a low-temperature thermostat will only be effective when the vehicle is moving because heat cannot be removed unless there is air passing through the radiator. Whether you are using an aftermarket radiator or not, this thermostat will provide the best possible heat dissipation from your setup, along with a faster warm-up time and better cold-weather performance than a 160° unit or a thermostat that merely had holes drilled in the diaphragm.

Features and Benefits:
- Same Diaphragm Size and Bypass Control as OEM Units 
- Promotes Maximum Efficiency of Cooling System 
- Direct Replacement 
- Optimized for Applications with a Custom Tune 
- Faster Warm-Up Time and Better Cold-Weather Performance

Beware of aftermarket companies who sell a general thermostat for all Ford modular engines. Reische Performance thermostats are the only ones designed precisely for a proper fit on each particular application, making them the best performing low temp units on the market! Typically with Reische’s 170° Performance Thermostat installed, your cooling fans should be set to turn on between 184-190° and shut off between 176-182° for optimal results, if not then re-flash your tune with the appropriate settings.

Vehicle Fitment:
- 2011-2017 V6 Mustang
- 2012-2013 Boss 302 Mustang
- 2011-2022 GT Mustang
- 2015-2020 Shelby GT350/GT350R Mustang
*NOT for use with GT500.

The specialists at Reische believe that a 170° opening temperature provides the ideal balance for high-performance engines, supplying high flow to your radiator by mid-180 temperatures while still providing good all-season performance. With proper fan settings, your coolant temperatures in cool weather should be in the 170s and in hot weather the 180s, giving those running high levels of timing and/or boost added protection against engine-damaging detonation as well as a maximum power output.

*All Reische Performance thermostats ship with coolant ratio/additive recommendations.

Please Note: Does NOT include a new Gasket or O-Ring.