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Most of the blowby will be metered air(over 90%), so the correct way to route it is AFTER the MAF just like the stock setup.
For a quick proof on the mass of meter air vs. total blowby - the only other mass added to the combustion process is fuel, and that'll typically range from about 11-15:1, so less than 10% the total combustion/blowby amount.
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