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Fleece Performance 03-07 Manual Transmission Cummins Coolant Bypass Kit w/ SS Braided Line

SKU: FPEXFPE-CLNTBYPS-CUM-J49O

Water Bypass Kits

FPE Coolant Bypass Kits...

Fleece Performance 03-07 Manual Transmission Cummins Coolant Bypass Kit w/ SS Braided Line

SKU: FPEXFPE-CLNTBYPS-CUM-J49O

Water Bypass Kits

FPE Coolant Bypass Kits...

A$840.75
LAST ONE! Est Ship 3-5 days. LAST ONE! This is the last unit at our distribution centre. Contact us if you need more. The ETA is the approximate time required to prepare your order for dispatch.
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Description

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. 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.

Part Type

Engine Coolant Bypass Kit

Data: v4.2 - Upd: 2026-10-13 23:15:22

Features

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

Specifications

Product Attributes - Brand
Fleece Performance
Product Attributes - Manufacturer's Part Number
FPE-CLNTBYPS-CUMMINS-MAN-SS
Product Attributes - Part Type
Water Bypass Kits
Product Attributes - Product Line
Fleece Performance Coolant Bypass Kits
Product Attributes - UPC
670875715040
Product Attributes - Water Bypass Spacer Included
Yes
Product Attributes - Water Bypass Spacer Material
Billet aluminum
Product Attributes - Water Bypass Spacer Finish
Black anodized
Product Attributes - Water Bypass Hoses Included
Yes
Product Attributes - Water Bypass Hose Material
Braided stainless steel
Product Attributes - Fittings Included
Yes
Product Attributes - Fitting Material
Aluminum
Product Attributes - Fitting Color
Black
Product Attributes - Quantity
Sold as a kit.
Product Attributes - Notes
Fits models with manual transmission.

Reference Information

Brand Name/s Fleece Performance
StreetFX SKU fpexFPE-CLNTBYPS-CUM-J49O
SFX Item ID 4228155
Supplier Item Code 4228155
Manufacturer SKU FPE-CLNTBYPS-CUMMINS-MAN-SS
Manufacturer UPC 670875715035
Alternative References fle-s0301

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