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Old 10-22-2022, 03:57 PM   #6
KillerBMotorsport
NASIOC Vendor
 
Member#: 198281
Join Date: Dec 2008
Chapter/Region: MAIC
Location: Virginia
Vehicle:
2005 WRX/STi
WRB of course

Default

Don't block any of the ports.

The large ones are the crankcase balance ports and the smaller ones are PCV.

The PCV Valve is either on the back side of the manifold, or in the plastic adapter on the rear breather port tee (depending on what year engine). Some AOS units (like ours) remove the PCV valve, some do not.
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