The Cummins QSB 5.8-liter diesels, putting out 425 hp each, purred as we wove our way out of the chaotic dock area of Miami's in-water boat-show venue. What a zoo for any boat driver! Bad currents and foul winds make getting in and out even more challenging than do the oversize boats sticking out into the channel, creating mammoth blind spots around corners. Pulling out of the slip showed that the Cummins provided a moderate jump when you put them in gear, but I've seen much worse. Whether in low idle or regular, the 330 handles with inch-by-inch control around the dock - thanks be.