Fleece Performance® FPE-CLNTBYPS-CUMMINS-6.7 - Coolant Bypass Kit

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Fleece Performance Engineering Accessories

Coolant Bypass Kit (FPE-CLNTBYPS-CUMMINS-6.7) by Fleece Performance®. Fleece has designed coolant bypass kit with 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. Kit comes with high quality AN o-ring fittings and AN hose connections with braided hose to ensure a leak free installation.


  • Designed to deliver trouble-free, consistent performance
  • Right for your vehicle and lifestyle
  • Made from high-quality materials for ultimate durability
  • Manufactured to meet or exceed strict quality requirements

The Cummins engine cooling system was designed to adequately cool a 300-350HP engine. When the horsepower is increased there is an increased demand on the cooling system. The rear cylinders suffer from a lack of coolant flow, and therefore, experience the highest coolant temperatures. This can cause excessive pressure to build in the system, especially the rear of the block and possibly blow out freeze plugs externally, or the smaller diameter plugs under the valve cover, leading to a failure.

Fleece Performance Engineering Inc. (FPE), a leading truck builder in the automotive aftermarket industry, was set up by Brayden Fleece, Chase Fleece, and Chad Huff in 2007. The company is famous for its innovative products such as TapShifter, Cheetah Turbochargers, and TurboBrake. It's also popular among competition drag racers thanks to custom tuning, transmission upgrades, and engine builds. Today Fleece provides a variety of reliable products as well as develops innovative ones following its principles of high quality and innovation.

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Warranty Information

Fleece Performance Engineering® warrants its products to be free from defects in materials or workmanship for a period of 1 year. The Warranty period begins on the date the product is delivered.

The Warranty is granted to the end-user and applies to products which are purchased, installed, and used for the purposes for which they are originally designed. This Warranty covers defects arising under normal use and does not cover malfunctions or failures resulting from misuse, abuse, neglect, improper installation, or incorrect maintenance.

During the Warranty period, Fleece Performance Engineering will repair or replace, at no charge, a product that is defective in materials or workmanship. Fleece Performance Engineering reserves the right to either repair or replace a defective component at its discretion and reserves the right to substitute an equivalent product under the terms of this Warranty.

Magnuson-Moss Warranty Act:
Legally, a vehicle manufacturer cannot void the warranty on a vehicle due to an aftermarket part unless they can prove that the aftermarket part caused or contributed to the failure in the vehicle (per the Magnuson Moss Warranty Act (15 U.S.C. 2302(C)) Learn More

Vehicle Fitment

Dodge Ram
2015 Dodge Ram
  • 2500 / 3500 6.7L
2014 Dodge Ram
  • 2500 / 3500 6.7L
2013 Dodge Ram
  • 2500 / 3500 6.7L
2012 Dodge Ram
  • 2500 / 3500 6.7L
2011 Dodge Ram
  • 2500 / 3500 6.7L
2010 Dodge Ram
  • 6.7L
2009 Dodge Ram
  • 6.7L
2008 Dodge Ram
  • 6.7L
2007 Dodge Ram
  • 6.7L Late Models
Ram 2500
2015 Ram 2500
  • 6.7L
2014 Ram 2500
  • 6.7L
2013 Ram 2500
  • 6.7L
2012 Ram 2500
  • 6.7L
2011 Ram 2500
  • 6.7L
Ram 3500
2015 Ram 3500
  • 6.7L
2014 Ram 3500
  • 6.7L
2013 Ram 3500
  • 6.7L
2012 Ram 3500
  • 6.7L
2011 Ram 3500
  • 6.7L
Ram 4500
2015 Ram 4500
  • 6.7L
2014 Ram 4500
  • 6.7L
2013 Ram 4500
2012 Ram 4500
2011 Ram 4500
Ram 5500
2015 Ram 5500
  • 6.7L
2014 Ram 5500
  • 6.7L
2013 Ram 5500
2012 Ram 5500
2011 Ram 5500
Low Prices Price match guarantee
In-House Experts We know our products
Guaranteed Fitment Always the correct part
Easy Returns Quick & Hassle Free

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