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It doesn't recirculate anything... it just bypasses air around the throttle body from the intercooler or recirculation manifold into the intake manifold through the 2 larger hoses attached to it.
That is no different than holding the throttle open a tiny bit.
If you don't understand that, look up the word "bypass" in a dictionary.
It takes about 21+ inches of vacuum to open the golden vacuum limiter saucer valve and the only time a very low compression 930 can possibly ever have intake manifold that high is while decelerating with the throttle completely closed.
You can check how much vacuum it takes to open the thing with a mightyvac tool.
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