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In 2020, the Environmental Protection Agency (EPA) granted regulatory relief to boatbuilders facing Tier IV requirements for engines over 800hp. According to EPA regulations, any engine over 800 hp would have had to meet strict Nitrogen Oxide—NOx—emissions rules, but on many vessels, it just couldn’t be done. The size of the available solutions, which called for large truck-based SCR systems and additional tankage for the DEF used in those systems, won’t fit on smaller vessels. Added to the…

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Paul Molyneaux is the Boats & Gear editor for National Fisherman.

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