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The side connected to the intake tube is is the “intake” side of the pcv system, sucks in clean, filtered air. The rear that connects to the intake manifold is the “exhaust” side which recirculates the blow by back into the engine. When you go FI, the stock pcv cant handle the excess air and blow by will “burp” out the intake side of the pcv system (the side that connects to the intake tube). I personally run an open fitting that is also bigger, in the rear side and vta on both sides. No problems.
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