I have heard a few of those vernatone and water lift mufflers.They do quite the exhaust noise.The fiberglass ones help absorb noise in the case so it's even quites the engine room drone.However,they do not help with mechanical noise that diesels are so famous for.I love the sound of a hot rodded 5.9 Cummins but I the mechanical noise that a BT would make in a boat.The turbo 5.9 aren't very loud as far as exhaust noise.Maybe turbo whistle when running up,but that quites down once the cruise rpm are reached.It's late,and I have had a long day.I'll quit rambling now.
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What a pain in the transom.
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