If the inside of your motor box isn't insulated then it will be noisy but it easy to insulate the box with spray on foam or place sound absorbsion panels in it.
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Tis better to be quiet and thought a fool than open your mouth and prove it!!
1991 V-20 cuddy I/O 350 volvo duo prop, 1998 15ft Grumman 9.9 Johnson 
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