D6T, D7E and D8T dozers are not only powered by Cat ACERT engines designed to meet Tier 4-I emissions standards, but also have new features. Net horsepower ratings range from 205 to 310; and engines use Cat NOx-Reduction System, Cat Clean Emissions Module and Cat Regeneration System. All three models are grade-control ready with integrated harnesses from the factory. Cab interiors feature streamlined dash displays and instrumentation.