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Wear ear plugs. I do and my bike is quiet, but the noise of the wind is enough to slowly damage your hearing by itself.
Riveting the muffler won't work out too well. It will leak and eventually sound even worse than it does now. You might be able to have it rewelded at a muffler shop. Another option might be to look around for a tractor muffler or a glasspack, I've seen them used on bikes before, but have not heard any in real life.
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