OVERVIEW The 6.4L manifold set is crafted with a heavy duty 0.25" thick-walled Hi-Silicon ductile casting, this makes these manifolds thicker to combat cracking due to high exhaust temperatures. To maximize exhaust flow, computational fluid dynamics were used to optimize flow and exhaust port geometry. BD's exhaust manifold set is the perfect replacement for reliability, performance and peace of mind. FEATURES Ports are gasket matched to maximize exhaust flow Performance high-silicon ductile cast iron Pre-drilled for pyrometer probes and pressure gauges High temperature black paint Includes 6 exhaust studs (mates to up-pipe flange) Cylinder head to exhaust manifold gaskets included Fully emissions compliant INSTALL TIME 12 Hours 48 Minutes WARRANTY Parts 36-Months 75,000 Miles EMISSIONS This product does not require an EO in California. By nature of its design, it is legal for sale and use in all 50 states. Replacement parts included. (EMS:4) Download Instruction Manual Here