FWIW, I have never owned a Mainship, but I have worked on several that had poorly engineered exhaust systems that allowed salt water contamination of the turbo, leading to catastrophic engine failure.
Boatdiesel.com and sbmar.com have lots of info on the topic, might be a good idea to educate oneself about this issue before buying.
Never assume that just because it was built that way it is all good.
Engineering gets trumped by aesthetics, and things go wrong.
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