The BD-Power 1041550 X-Flow Intake Elbow for your 98.5-02 Dodge 5.9L Cummins features a larger plenum for airflow, and smooth radius turns to reduce turbulence and intake pressure losses. BDs unique design positions the fasteners outside of the manifold (instead of through it), and two convenient ports (one pre-tapped) make it easy to monitor boost and/or inject nitrous oxide or another power adder.