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Seems like you'll need a "asphalt" style mat on there to stop the resonating of the flat panel above the exhaust. Basically that flat piece of metal is acting like a speaker due to being directly over the exhaust. You want to stop that piece of metal from moving and amplifying the exhaust. A sound blocking technology like dynapad might not be the best choice as it is designed to absorb and block road noise and vibrations not prevent flexing or vibration of the panels themselves.
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