Design
Intake system
The intake system is divided into two sections, the upper and lower intake manifolds. The upper intake manifold is made of plastic for naturally aspirated and turbocharged engines. The lower intake manifold is aluminum for both types of engine to protect the fuel injection nozzles in the event of a collision.
The intake system for naturally aspirated engines has a total volume of 5.3 liters with fixed barrel lengths. On turbocharged engines the total volume is 3.0 liters with short barrels.
The gasket between the lower intake manifold and cylinder head on naturally aspirated engines is a calibrated single gasket. On turbocharged engines there is a double gasket with a built in non return valve.