The Fleece Coolant Bypass for Manual Transmission (FPE-CLNTBYPS-CUMMINS-MAN) is an aftermarket upgrade for 2003–2007 Dodge Ram trucks with 5.9L Cummins diesel engines and manual transmissions. It improves coolant flow to the rear engine cylinders, addressing overheating issues and enhancing engine longevity. Designed for durability and easy installation, the kit includes all necessary components and is favored by Cummins owners for boosting performance and reliability.