Fleece Performance FPE-CLNTBYPS-CUMMINS-0305 Cummins Coolant Bypass Kit 2003-2005 Auto Trans Fleece Performance
SKU: 64976363296

Fleece Performance FPE-CLNTBYPS-CUMMINS-0305 Cummins Coolant Bypass Kit 2003-2005 Auto Trans Fleece Performance

Sale price$245.70 Regular price$273.00
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Description

Fleece Performance FPE-CLNTBYPS-CUMMINS-0305 Cummins Coolant Bypass Kit 2003-2005 Auto Trans Fleece PerformanceIncreased Coolant Flow, Decreased Coolant Temperatures The rear cylinders on the 5. 9 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

Increased Coolant Flow, Decreased Coolant Temperatures The rear cylinders on the 5.9/6.7L 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.

Benefits:

  • 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.
  • Kits for MY 2003+ include billet hose brackets.

Why do I need a Fleece Coolant Bypass? One of the biggest issues on the 5.9/6.7L 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. The '03-'07 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 ‘07-‘13 6.7 trucks, both automatic and manual equipped transmissions, do not have a transmission fluid heat exchanger.

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Exchange/Return Notes
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  • Final sale items are not eligible for returns or exchanges.
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SKU: 64976363296

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William Abruzzo
Boise, US
★★★★★ 5
Kona Air Filter
Size: 9.33" x 6.29" x 2.08"
Very satisfied, it fit perfectly!
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Reviewed in the United States on March 31, 2026
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rcevans
Waukegan, US
★★★★★ 5
Engine air filters are important!
Size: 8.26" x 5.63" x 2.24"
Just like me and you breathing, your car performs better when it can breathe freely and cleanly. My philosophy with an engine air filter is to replace with cheap and often. You can't control the quality of air coming into your system but you can control the filtering, so I'd rather replace the filter on an accelerated schedule with a cheap product than to invest into something more expensive and have it perform dirty for longer than it should. For my Honda CRV 2024 Hybrid, this filter fits snuggly and performs well.
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Reviewed in the United States on December 1, 2025
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Jeff
Bozeman, US
★★★★★ 5
honda civic
Size: 17220-5AA-A00
Great item and price, well packed. Arrived as scheduled. They fit my Honda Civic Xle
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Reviewed in the United States on April 23, 2026
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Digigeek
Chelsea, US
★★★★★ 5
Good non OEM replacement filter
Size: 165465NA1C
I recently purchased the Forccord 2-Pack Engine Air Filter for my INFINITI QX50 (2025/2024-2019) and QX55 (2025/2024-2022), and overall, it’s a decent alternative to the OEM filter. Pros: Perfect Fit – Installed easily in my QX50 without any issues. Fits just like the factory filter. Good Filtration – The material seems effective in trapping dust and debris, helping keep the engine clean. Affordable 2-Pack – Great value compared to dealership prices, especially if you replace filters regularly. Improves Airflow – Noticed a slight improvement in engine responsiveness and fuel efficiency. Cons: Not OEM Quality – The filter material feels a bit thinner and less sturdy compared to the original Infiniti filter. May Not Last as Long – While it works fine now, I’m unsure if it will hold up for the same mileage as an OEM filter. No Installation Instructions – Though easy to install, a simple guide would have been helpful for first-time users. Final Thoughts This Forccord air filter is a good budget-friendly replacement that fits well and performs decently. However, if you prioritize OEM durability and quality, you may want to stick with the original Infiniti filter.
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Reviewed in the United States on February 15, 2025
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Amazon Customer
Whiting, US
★★★★★ 5
Keeps your engine running
Size: 17220-5AA-A00
Fits well, fair price, does the job as promised
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Reviewed in the United States on April 20, 2026

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