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I think you have something loose that is rattling from the wind at speed. I've read a couple of scenario's on here about an issue such as yours.
1) The hood release cable was rattling at speed. Not secured properly. Sound would radiate inside.
2) Person said a tag on the front suspension spring would flap in the wind against the spring and the sound radiated into the cockpit of the car.
These are a couple of things I read that might be able to help you. Because you stated that it happens at speed, not when stationary.
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