One of the desired features I wanted in a boat was a generator -- it makes long anchorages more practical from a power perspective and provides power for higher power accessories like air conditioning and normal 110 volt appliances.
We got lucky and our 310DA has a generator, a Kohler 5ECD, but it didn't come with the generator noise shield and we're finding it to be louder than we'd like. From what I can tell, the noise is actually engine running noise and not exhaust noise. The noise from the exhaust is muffled by the "wet" exhaust system which mixes exhaust gasses and raw cooling water and is generally acceptable.
From what I've been able to determine, there's two solutions. One is an aftermarket sound shield, a custom-sized "soft" frame-based structure that surrounds the generator and muffles the noise. The other is the Kohler OEM sound shield.
The aftermarket solution is $1250 plus my labor to install it. It has a number of challenges, mostly correctly marking the openings necessary to accommodate the inputs and outputs and then the challenge of mounting it. The manufacturer also says the generator should be mounted on a separate base to effectively isolate noise. While there is a pan underneath mine, I don't think it's mounted on any separate mounting point.
(As an aside, I often find myself wishing I had photos of these things when I don't, and think to myself I need to just take a 5 minute detailed video of the engine room, slowly panning over everything. This way I will get at least a glimpse of something I'm thinking about if not a decent still I can extract.)
As it happens, the OEM sound shield is still available from Kohler but it's extremely expensive, over $2000 and probably half that to retrofit it to the boat.
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