GPP exhaust manifolds have heavy walled elbow connections preventing burning out, plus, hold in exhaust gas temperatures enhancing turbine pumping efficiency while the runners have been optimized to improve velocity and evacuate the cylinders. Manifolds are coated to resist corrosion and are pre-drilled for pyrometer probes. Other manufactures’ kits utilize stock Ford 6.0L exhaust manifolds which are prone to rusting and leaking, and, require extensive cleaning and machine work to be recovered from warping and distortion. GPP’s exhaust manifolds are not only built to last, they are designed for the most optimal flow performance. This kit includes: 6.0 exhaust manifolds, 6.0 exhaust manifold gaskets, manifold spacers, and all necessary bolts/hardware to mount on a 6.4L Powerstroke diesel engine (up-pipes, up-pipe gaskets, up-pipe hardware, and A/C line NOT included) Features: Increased Reliability Increased Flow & Performance Durable, Heavy-Walled Manifolds NOTE: You must supply your own up-pipes and additional hardware to use this kit on a 6.4 Powerstroke engine. Please contact us if you need assistance.