yeah, what the genset manufactures figured out was that to make them quiet you have to have an integrated solution. the big box around it is part of that, keeping the various pieces of ductwork, etc from vibrating is part of that, as was going to liquid cooled.
Easy solutions are the rubber mounts to the frame, stuff like dynamat on the box and the RV structure around the genny, valve adjustments, and surprisingly, the fuel pump. Interrupter pumps are awful noisy even when isolated. I used to be able to hear my little FACET cube pump over an unmuffled race engine. After one of the mounting ears broke off from metal fatigue I replaced it with one of their new plastic pumps - all the time thinking I was getting a cheaper, less reliable piece of trash, and it's worked longer than any of the metal ones I've had and you can't hear it run at all because the plastic damps the chatter so well.
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