something in front of the throttle blade can't create a vacuum leak. But you'd have to cork the other part I suppose and use a conventional bov. The OEM system sounds like a nifty efficiency trick, great if the aftermarket ecu can control it.
I have it behind the throttle body. I was told it would damage the throttle body if it was in front of it at wide open then suddenly let off the throttle. I can't find a reference to an MMX bypass either.
