i have the same problem as well when i am doing 170km/hr .when i let go the throttle and slow down below 170 the sound goes off..and when back above 170 the loud humming sound and slight vibration comes back.it comes from the front and not the rear section of the car.even close windows and on my aircon its still very obvious. i am on michelin pilot pp2 17" 235 . could it be the tires or the bearings? or is it something more serious like knocking or detonation ?
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