I know this has been discussed on here and other sites, but I have been mulling the issues associated with a 5.9/6.7 Common Rail swap into an XD. I am truly interested if the wiring would be compatible (hear me out). The 5.0 is controlled by a CAN system (as mandated by law) and the engine controller is presumably made by or programmed by Cummins. With this in mind, I am wondering if wiring the 6.7 controller into the system (essentially replacing the 5.0 controller) would provide appropriate CAN signals to the other nodes in the truck to make it work. The sensors provide the same signals, although the 6.7 has one or two the 5.0 doesnt, and vice versa (e.g, the VGT turbo vs the rotating valve on the 5.0 have individual sensors). That being said, I think tuning would smooth that out. While I am no where near doing this myself at this point as my 5.0 is functioning fine and only has 30,000 on it right now, I still think it is a matter of time. If nothing else, once this truck is paid off I will seriously consider tackling this myself. I think as these trucks age there will be a market for this type of swap.