I queried DC to see if the latest info was available for the 4. 5 relative to their shop manuals. They said all their info was updated with the latest information so I purchased the CD which was backordered at the time so naturally I figured if its back ordered then it must include the 600. Well, no it didn't so be be careful out there when looking for the 600 info. Also the wiring diagrams are somewhat different for the 4. 5.