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Ok, another bypass valve could work if it doesn't open below the opening vacuum the 930 bypass valve opens. If you find one that does it will open at idle because there is intake manifold vacuum at idle and you'll have an idle speed around 1500rpms that you can't lower.
Some Mercedes from the 25+ years ago had deceleration/vacuum limiting bypass valves with an external threaded adjustment with locknut for the spring tension against the internal diaphram that opens the valve seat.
Maybe you can find one of those somewhere.
Most of the ones I've seen had smaller hose fittings though so they won't flow as much air as the large saucer shaped one on a 930.
I'm almost sorry if I sounded sarcastic with my comment... i'm not perfect and don't pretend to be.
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