Can you be more specific, do you think it is more a wind generated sound, or could it be tyres? Even OEM tyres can get very noisy as they wear. For me, tyre roar is a common source of irritation in some BMW cars. Bigger the wheels, (less rubber to absorb the sound) typically the more noise comes through the car.
BTW, some tyre noise can sound like a wheel bearing issue. It is that loud, or drones.
HighlandPete
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