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I have the adjustable Meisterschaft on my 2013 M5. It definitely has noticeable drone when the value is closed. I actually find it a bit annoying, especially since the car is often in or passing through the 1600-2000 rpm range. And when the valve is open, the drone gets unbearable after ~10 minutes. It appears to be very subjective since I know others have said there is no drone. I can only assume it's because they have bad hearing, though. The system sounds amazing, though, especially to bystanders. Would I do it again? Probably not.
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