A used '05 5.9 Cummins for $2800? I don't know, that sounds pretty cheap, even with 1/2 the miles it seems like the injectors on the used motor would be on borrowed time, plus swapping a Cummins is probably a lot bigger job than doing injectors, plus, for a Cummins, it's only about 1/2the way used up at best. That doesn't make any sense to me