It's pretty much as Jayhovah said:
The two inner inlets/outlets (depending on who configures them) route back to the inlet nipples of the AAM intakes. The two outer inlets/outlets route back to the front outlets from the PCV valve on the engine; the two nipples on the front of the intake manifold are capped off along with the two outlets that the rubber lines run back to on either side of the engine.
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