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Since I started this thread a long time (and three Porsche's later) ago I thought it appropriate that I pass along the final fix. Mine was a part, as I recall, called the Carbon Control Valve. when I pulled the inner fender liner loose it was way up there and was not very easy to get too. But replacing it did fix the problem. And as it turned out when I pulled it out it was cracked and that was probably why it was leaking air at the certain RPM and causing the howl.
I think Renntech was where I found the fix.
And yes, it drove me NUTS!
Roger
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