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My Boxster sometimes makes a "woooooo" sound from the fuel filler door area and it sounds like that is the general vicinity of your noise too. The other suggestions made in this thread are on target but if they don't pan out it might be the fuel tank vent system. There are a couple of electrically operated valves near the fuel filler door behind the inner fender liner. Some people have replaced those valves and fixed the sound but I'm not totally sure your noise is the same thing. I bring it up in case the more logical sources don't seem to be the cause.
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