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with or without the GHK installed. If the recirc's vacuum diapragm is properly plumbed to reference intake manifold boost pressure, the valves will not open under any PSI until the throttles are shut and the manifold builds vacuum. You could purchase aftermarket BOVs on the assumption that they flow more air than the factory recircs - but do any manufacturers list that data?... Nope. As far as I'm concerned, the BOV manufacturers are selling a device that "sounds" like it's flowing a lot of air, and that sound comes from a restriction that has more emphasis on sound production than air flow. I would think the most important aspect of any of these should be air flow, since their primary function is to reduce compressor surge during off-throttle high-boost conditions. Someday I'm going to do a flow test on the recircs and as many BOVs as I can lay my hands on.
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