aFe 46-40024 BladeRunner Ported Ductile Iron Exhaust ManifoldsaFe 46 40024 BladeRunner Ported Ductile Iron Exhaust Manifolds Machined Ports: These manifolds have both the inlet and the outlet ports machined to match the factory gaskets. This allows for maximum flow, without compromising gasket performance. Auxiliary Ports: An Exhaust Gas Temperature (EGT) probe port is incorporated into each manifold for easy installation of gauges or testing equipment. There are three additional cast in bosses provided to allow