Caterpillar Marine Power Systems and Caterpillar Emissions Solutions announced that the United States Environmental Protection Agency (EPA) has certified Cat 3500 Series Marine Emissions Kits according to EPA Rule 40 CFR Part 1042. This Marine Remanufacture Program applies to many commercial engines flagged or registered in the United States, and the requirements include a 25 percent particulate matter reduction at overhaul. By replacing the mechanical unit injector (MUI) system and other associated components on the engine, the upgrade kits offer vessel owners an in-hull solution that exceeds the requirements, and offers operational benefits.