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I had the exact same sound when I first got my BRZ and drove on the interstate.
For me, it was the panels under the car on the passanger side (US model). Over here the panels under the car do not cover the entire under body as they do in Japan. Because of this they have some play up and down, and can rattle at highway speed.
Some have added thicker washers to stop the movement. I used clear caulk at points around the panel to keep them from moving.
Sound gone!
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