You would need, obviously, the NEMA 34 motors, as well as the higher current drivers, cables and connectors and a second 600W power supply. It looks like the bridge board, BoB and most of the other internal components are the same between the two. The case even looks to be the same except for different cutouts on the I/O panel for the higher current motor cable connectors. Your best bet for knowing for sure would be to call CRP they are really good at figuring out and pricing parts for upgrades like this.