aFe 46-40012 BladeRunner Ductile Iron Exhaust ManifoldaFe 46 40012 BladeRunner Ductile Iron Exhaust Manifold The aFe BladeRunner exhaust manifold for the popular 03 07 Dodge Ram Cummins with the L6 5. 9L (td) engine sets a new standard in manifold design. In recent testing, this exhaust manifold outflowed the factory exhaust manifold by up to 23%, improving performance and throttle response. The thick wall (0. 25" vs. 0. 15")T3 flange design increases strength, eliminating warping and cracking prevalent