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There really is no reason to replace the pcv valve with an AN fitting. Also routing it to your exhaust properly will pull a vacuum on the crank case still. In all actuality running it in the exhaust is pretty much the same thing as putting it in the turbo inlet if not better. There isnt much of a vac AT ALL between your filter and turbo and if there is your filter is too restrictive. There is a small lack of pressure but it really isnt drawing as hard on your crank case as you might think.
The shape of the venturi does cause a pull on the crank case (if positioned properly). The velosity of your exhaust will create a lack of pressure in the system and pull on the crank case. Just as in your turbo inlet, there really isnt a vacuume to be measured, there really isnt positive pressure to be measured in your exhaust.
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