The old 2-71 generator sets are really nice. The 71 series engines at 1200 rpm are actually not particularly loud. As an operator I just prefer the John Deere engines because the parts availability is better and I don't have to work through that crazy Detroit Diesel parts manual. I'm down to one 4-71 in my fleet that runs a winch. We also sold all of our boats with 12-149 and 12-645 and 16-567 engines. Dag-um that 149 series was loud.