aFe BladeRunner Exhaust Manifold Dodge/RAM 1500 09-18/RAM 1500 Classic 19-24 V8-5.7L HEMIThese manifolds have both the inlet, and the outlet ports machined to match the factory gaskets. This allows for maximum flow, without compromising gasket performance. These manifolds have 25% Thicker walls than the crack prone factory manifolds. The increase in thickness increases the rigidity of the manifolds and make them much more durable than the OE manifolds. These manifolds bolt directly to the factory y pipe for an easy installation.