Red arrows must be plugged or you get a vacuum leak which messes up the mixture. Green arrows need to be open, or vented to allow pressure that escapes by the rings into the crankcase to escape. Normally it gets sucked into the intake ( red arrows) and burned in the cylinders.

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2005 X5 4.4i SterlingGrau, Sport Package, DSP
Build 3/12/2005