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Cummins Coolant Bypass Kit. Another product from Fleece Performance built out of necessity is the 2003-2016 Cummins Coolant Bypass kit. 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.
Weve designed our 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. Our kit comes with high quality AN o-ring fittings and AN hose connections with braided hose to ensure a leak free installation.
The 2003-2007 5.9L automatic transmission version will eliminate the factory transmission fluid heat exchanger. The heat exchanger is not a fluid cooler; it was designed for use in cold climates to warm the transmission fluid with the engine coolant. It is not necessary for use in warm climates or high horsepower applications, nor does it detrimentally affect the trucks performance when removed.
All 2007-2016 6.7 trucks, both automatic and manual equipped transmissions, do not have a transmission fluid heat exchanger.
For customers with a 6.7L that has a heat exchanger, You will need a heater tube it can be purchased at your local Chrysler Dealership PN:68048997AA. It is very rare that a 6.7L has a heat exchanger, but we have had a few instances where it has been needed.
Other Part Numbers:
Fleece Performance #FPE-CLNTBYPS-CUMMINS-0305-FQWW
⚠ WARNING:
Cancer and Reproductive Harm
https://www.P65Warnings.ca.gov
Fleece Performance is an aftermarket company established in 2008 in North Salem, IN, by Brayden and Chase Fleece. The company is known for manufacturing performance parts for various diesel engines. Today, Fleece Performance is the leading brand in the market when it comes to diesel aftermarket parts.
Diesel Performance Parts ExpertsThe company’s founders Brayden and Chase, are fellow enthusiasts themselves. They decided that they wanted to improve the products already existing in the market. Using their vehicle as their product’s testbed, they created some of the best parts available today. As a result, they have established a reputation as a brand that provides innovative products that pushed the limits of diesel performance technology.
Quality Made ProductsThe company offers a wide range of turbochargers, AN Fittings, Fuel system parts, and cylinder head kits. They cater to a variety of automotive brands such as Ford, Dodge, and Chevy. Each product is carefully designed to produce optimum performance and is developed, assembled, and tested in their in-house facility.
The company received its ISO certification in 2020, which shows that the company adheres to the strict standard set by the regulators.
Purchase Fleece Performance Products At Vivid RacingIf you are in the market for high-quality diesel performance parts, then Fleece Performance is the brand for you. They have been manufacturing quality parts for more than ten years and has gained the trust of many diesel enthusiast and racers alike. To know more about Fleece Performance, visit Vivid Racing and check out their list of products that fit your specific need.
LIMITED WARRANTY ON NEW FLEECE PERFORMANCE ENGINEERING PRODUCTS (US AND CANADA ONLY)
Fleece Performance Engineering will provide for repairs or replacement, at its option, during the warranty period of each new product model listed on page 2 in accordance with the following terms, conditions, and limitations: View HERE
| Sale price | None |
| Wholesale price | $360.08 |
| Shipping |
Weight: 8.00 Length: 3 Width: 16 Height: 12 |
| Product Added At | Thursday 02 August, 2018 |
| Product Modified At | Friday 11 July, 2025 |
| Imported By | ETLOverride |
| Last Edited By | vendordata@vividracing.com |
| View In Admin |
| Carb Approved | Yes |
|---|---|
| Carb Number | D-834-9 |
| Epa Status | Compliant |
| Prop65 | Unknown |
| Carb Required | - |
| Vendor | Inv | Cost | Retail | Jobber | MAP | Core | Updated | |||
|---|---|---|---|---|---|---|---|---|---|---|
| Fleece Performance | $305.15 | $376.95 | $323.10 | $359.00 | ? | 2025-07-11 06:02:31 |
