Upgrade the Rocker Arm Valve Bridges in your 1998.5-2022 Dodge 5.9L & 6.7L Cummins with the XDP Billet Rocker Arm Bridge Set XD318. From the factory, your Cummins rocker arm bridges are only designed to operate under the stock output levels. The added stresses and load from a modified engine can quickly exceed the levels the that the stock rocker arm bridges can support. The XDP Rocker Arm Bridge Set is built from CNC machined billet 4140 chromoly for long lasting durability, and a perfect fit and finish. Sold as a set.