Fleece Performance 03-07 Dodge 5.9/6.7L Cummins Coolant Bypass Kit (03-07 Manual Trans) Early Cummins 5.9 3L Powerstroke running in the

3L Powerstroke running in the most extreme environments

The drop-in design ensures a straightforward installation and connects to all your existing factory equipment

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

2009 Chevrolet Tahoe LS

2002 GMC Sierra 2500 SLT

Fleece Performance 03-07 Dodge 5.9/6.7L Cummins Coolant Bypass Kit (03-07 Manual Trans) Early Cummins 5.9 3L Powerstroke running in theIncreased 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,