its right up there with magic pixi fairy dust. i'm sure there is some kind of measurable performance enhancement, but the reality is if you need to reduce engine room noise there are lots of things that you need to do first in the hierarchy of affectivity.
Vic is correct though. Sound deadening is both a science and an art. I'd look to cars as well as boats to find a solution. I've been told vibration is as bad as sound if not worse.
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