One problem with putting a 4 stroke on a boat designed for a 2 stroke is the weight. I don't know what your boat is rated for, but many people I know that have done that change and some experts I know all agree that it will bog down quite bad in the transom when you slow down. They don't have the torque of 2 strokers, so don't perform like you would think on a boat designed for lighter power.
That said, I repowered with Etec this season and at idle it is just a quiet as a 4 stroke, the engine is amazing. Sweet for trolling, (which I do lots of) And yes they ALL make noise running hard. 2 stroke scream, 4 strokes rumble. ????
Good luck with whatever you do.
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