Sort of like a car which uses a rubber and steel sandwich type system. My 400 is not all that bad, but the 470 was a totally different story - a lot better and probably comparable to that Hunter. I wonder if they did the same thing to the 400 Mark II when they dropped the Yanmar in. Cars have been using this type of system for 50 or 60 years - it's about time that they do something similar for us. I think the powerboats are a lot better at this kind of stuff too.
Most sailboat manufacturers seem to treat auxiliary power as an afterthought.
As far as noise goes, the insulation on the forward cover is decent, but there is absolutely nothing on the back cover. One of these days. A straight 6 is the easiest to balance - V6's and V8's require some work too. I'm referring to internal counterweights and balance shafts along with firing order and a thousand other things. I almost forgot about the vibration.