Fleece Performance 03-07 Dodge 5.9/6.7L Cummins Coolant Bypass Kit (03-07 Manual Trans) Early Cummins 5.9 Backed by XDP's 1-Year Warranty

Backed by XDP's 1-Year Warranty

Using a fiber reinforced plastic mix adds strength to the end tanks

2015 Toyota 4Runner TRD Pro

2002 Jeep Grand Cherokee Limited

Fleece Performance 03-07 Dodge 5.9/6.7L Cummins Coolant Bypass Kit (03-07 Manual Trans) Early Cummins 5.9 Backed by XDP's 1-Year WarrantyIncreased Coolant Flow, Decreased Coolant Temperatures The rear cylinders on the 5. 9L 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,