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Originally Posted by FordFociSHO
A design like a syringe needle is optimal, angled cut and opening. Think of it like sticking your hand out the window at 60mph, palm flat to the oncoming air. Your palm is the high pressure side and the back of you hand there is a low pressure area. This effectively creates a vacuum because the faster moving air will pull the slower moving air.
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There is a hack like this for Honda's I've seen (I posted it up once). It apparently works well for lowering pressure in the crackcase. I think it would work really well if you pared that up with the check-valve thingies you posted about last year. That way you should always get a vacuum in your crackcase at any throttle opening (N/A, of course, and stock, non-SVT, manifold), especially if you did both things.