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Message: <blockquote data-quote="Lanter" data-source="post: 1427142" data-attributes="member: 20552"><a href="http://www.modularmotorsportsracing.com/cart/index.php?main_page=product_info&cPath=2&products_id=551" target="_blank">http://www.modularmotorsportsracing.com/cart/index.php?main_page=product_info&cPath=2&products_id=551</a>You can do it either way, run the catch can as an open breather setup or run it back to a vacuum source similar to what it would have been factory.  Now the difference here is the only true full time vacuum source is on the compressor inlet side of the turbo.  It's no longer the intake manifold as it will be under positive pressure while in boost, you can leave the PCV valve in there and "trust" that it will keep the flow one direction but I wouldn't.  As soon as that valve fails you'll be pressurizing the valve covers and will eventually lead to bad news for you.  So either run the valve covers (with or without PCV valves) to a breather catch can or run the valve covers to a pressurized catch can that is held to vacuum using the inlet to the compressor.</blockquote>