Not Ranked
Could it be something inside the muffler that is either loose or to close to the outer cover that is vibrating and hitting the side of the muffler? Also have you tried having the car up where you can get under it with it running and listening with a stethoscope or some other means to see just where the sound is coming from. Maybe even use something that won't burn and put it against the exhaust pipe in the area where the sound is coming from and see if that changes it any.
Ron
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