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Like everyone said above.
However, a buzz could also be a natural consequence of a certain exhaust design.
If you're wondering if this is just how this exhaust is or if there is some shielding mounting problem or something, my advice would be to sound sample it and trade with the manufacturer and others who own the same equipment to see.
Also, changing out some portions of the complete exhaust path could create buzzing (and droning) in parts that previously were near quiet.
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