Coolant Bypass Kit for 2019-Present Ram with 6.7L Cummins Fleece Performance

$538.54 CAD


Just in time for Summer! Our all-new Fleece Performance coolant bypass for the 2019-Present RAM with 6.7L Cummins! Our patent pending design seamlessly integrates with your truck for an OE fit-and-finish.


  • Increased Coolant Flow, Decreased Coolant Temperatures
  • The rear cylinders on the 6.7L Cummins suffer from a lack of coolant flow, and therefore, experience the highest coolant temperatures.
  • This can cause excessive pressure to build in the cooling system, especially the rear of the block and blow out freeze plugs externally, or the smaller diameter plugs under the valve cover, leading to a failure.
  • Our coolant bypass kit adds a secondary thermostat, that unlike other brands, works based on temperature instead of excessive pressure. This solves the problem before pressure becomes an issue by ensuring consistent temperatures across all six cylinders.


  • Lowers coolant temperature at the rear cylinders
  • Ensures consistent temperatures across all cylinders
  • Prevents damaging coolant pressure build up
  • Complete kit comes with braided hose and AN O-ring fittings to ensure a leak-free installation.

Why do I need a Fleece Coolant Bypass?
One of the biggest issues on the 6.7L Cummins is the coolant flow problem to the rear cylinders. This can cause catastrophic failure or blow outs of the freeze plugs in an over-temperature / over-pressure condition. The Fleece Coolant Bypass is one of the most important additions you make to improve the reliability and longevity of the Cummins platform.

Kit Includes:

  • Rear coolant bypass thermostat housing
  • Front coolant bypass thermostat housing
  • New EGR cross-over tube gaskets
  • Black braided nylon coolant bypass hose with AN fittings
  • Mounting hardware


  • 1 Year Limited Parts Warranty

Additional information

Weight 8.00 lbs
Dimensions 16.00 x 13.00 x 3.00 in



Braided Nylon

Country of Origin


Sold As








Warranty 1 Year Limited Warranty
Make From Year To Year Model Sub
Ram 2019 2022 3500 Big Horn
Ram 2019 2022 2500 Big Horn
Ram 2019 2022 2500 Laramie
Ram 2019 2022 3500 Laramie
Ram 2019 2021 2500 Laramie Longhorn
Ram 2019 2020 3500 Laramie Longhorn
Ram 2019 2022 2500 Limited
Ram 2019 2022 3500 Limited
Ram 2019 2022 3500 Lone Star
Ram 2019 2022 2500 Lone Star
Ram 2019 2022 2500 Power Wagon
Ram 2019 2022 3500 SLT
Ram 2019 2022 3500 Tradesman
Ram 2019 2022 2500 Tradesman
Ram 2021 2022 3500 Limited Longhorn
Ram 2021 2022 2500 Limited Longhorn


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