aFe Power BladeRunner Ported Ductile Iron Exhaust Manifold 98.5-02 Dodge Diesel Trucks L6-5.9L (td)Eliminate the costly exhaust manifold cracks prevalent in the factory exhaust manifold. The aFe BladeRunner exhaust manifold for the popular 98. 5 02 5. 9L Dodge Ram Cummins (24V) sets a new standard. In recent testing, this exhaust manifold outflowed the factory exhaust manifold by 50% improving performance and throttle response. The thick wall (0. 25in. vs. 0. 15in.) design increases strength eliminating warping and cracking. The matched ports and a