LoanStew, I think the problem and perhaps the decline in muffler sales might be attributable to Aerodrone Syndrome.
One person when ordering was very apprehensive about the drone and hoping that he would not end up with a very expensive ash tray.
Another got used to it but when he had friends in the car they complained about it. It seems to be airflows at certain RPM's. The speed most drive when cruising distance 70 to 75 but varies.
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