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Fitment:
Improve cooling-system reliability on your 2003-2007 Dodge Ram 2500 or 3500 5.9L Cummins manual-transmission truck with the Fleece Performance Coolant Bypass Kit. Part FPE-CLNTBYPS-CUMMINS-MAN adds a temperature-actuated secondary thermostat to improve coolant circulation at the rear cylinders, where temperatures can be highest. By helping equalize coolant temperatures across all six cylinders, this kit reduces excessive cooling-system pressure and provides a clean, reliable OE-style installation.