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    Exhaust Water Flow vs Exhaust Noise

    "I have twin 6V53s with new 5& "I have twin 6V53s with new 5" Vernatone mufflers. The exhaust noise level is higher now than with the previous 3.5 inch original exhaust. The boat was repowered by a previous owner from gas to the DDCs without increasing the exhaust size. It has been suggested...
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