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Originally Posted by madrasahs
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For starters, how about catalytic converters on all truck-based boat engines that are used on protected lake waters ? (Converters bring boat engines up to automobile standards -- the highest standard in the world -- in noise and improved air quality).
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First off , catalytic converters are not a cure all as you may believe. Properly maintained and tuned powerboats (particularly newer fuel injected ones) are very low emission machines. "Cats" only put a bandaid , so to speak , on the ones that are too high and still that's no guarantee.
Cats would also require dry exhausts , since water going through them would render them useless , and we both know what that means since you already mentioned shutting the water off.