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squealing noise from under the car

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Vehicle Information: Model (Boxster, Boxster S,Cayman, Cayman S): Boxster; Year: 2002; Engine (type, size, modifications): 2.7 litre H6; Total Mileage: 30,000; Transmission: Manual;

I have a metallic squealing noise from under the car that sounds like a brake pad wear warning noise (common on American cars). It comes on after about 10 seconds at or above 45mph. It sounds (from a reflective surface near the car) like it coming from the front, but can't verify that. As I slow down the sound frequency gets lower and then disappears at about 15mph. I have replaced pads, rotors, checked for debris in the radiator grills, checked for spindle/hub bearing play on front rotors, turned off all front fans, checked for backing plate/rotor clearance and can't seem to locate source of noise. Porsche of Naples service guys can't seem to locate the problem either. I have yet to try the parking brake at speed to see if it's in there somewhere. Scott at Marine351 suggested it might possibly be a wheel bearing race that is corroded even though there's no hub play. Brakes are effective and straight, turning the car during the noise (even abrubptly) doesn't change it. Any ideas?

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