Another forum member with the same muffler (Top Speed) put a motorcycle baffle in one side of the muffler inlet and it changed the harmonics and solved the drone issue.
You might try this as it's cheap and worth a try. I have the same muffler and the cabin resonance/drone between 2-3k is awful and if I'm forced to keep it there my ears really start to hurt. Top down though it's glorious so I've chose to live with it.
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