Intake Manifold (Normally Aspirated)

The intake manifold is manufactured in plastic with plastic integrated fuel rails and metal thread inserts; the very smooth internal surfaces give excellent air flow.
Individual ducts lead off a central chamber to the intake valves of each cylinder.
Silicon rubber gaskets, located in channels in the intake manifold, seal the joints between the ducts and the cylinder heads.

Supercharged engines do not have a conventional manifold, but use a charge air cooler adapter assembly on each cylinder head to pass cooled air from the charge air coolers (one for each bank) to the engine intake. The fuel injectors and fuel rail are also located on each charge air cooler adapter assembly.