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If I'm reading your post correctly, it's not the noise you're concerned about, it's that the dry exhaust system shakes apart until it develops exhaust leaks, which are hazardous due to the heat and noxious gasses.
The engine was designed to operate with a dry exhaust, so I don't know if I'd change that. I served on submarines where sound and vibration isolation were absolutely critical to achieve the silence during operation that a submarine requires.
If I were you, I'd investigate installing a vibration dampening system at all of the exhaust system joints, and reducing the number of joints to the absolute minimum. Basically, you're looking at wrapping the tubing in heat wrap to reduce the temperature, and then connecting a circular bracket around it. Then, connect a rubber isolation mount to that, and connect it to a mounting point in the engine compartment somewhere.
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1973 Pearson 30 #255