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Your intake is sucking in un-metered air through the valve cover from the vented catch can and the open PCV valve port.
Speaking of the PCV valve, what would happen if one replaced it with a regular straight-through fitting and tee'd it into the hose going from the crankcase vent to the valve cover?
It seems that would simplify the system, so both sides could be vented through one catch can.
And I assume not having the PCV valve would be beneficial, since it closes under boost, which is when the crankcase is most pressurized.
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