technically correct, but at the COST of removing almost all of the emissions controls. the jury is till out on longevity and reliability on those mods. not to mentions that its federal illegal. heck, why bother with any of the emissions. just strip it ALL off. you've got compound turbos, right, so lots of power and black smoke when you stomp on it.
my point is that the 6.7 is not going to be easy to hack. if the European's experience with modding these systems is any indicator, the 'performance gains' are going to small and be expensive for those gains. the sensors and engine controls are so intertwined that it is not going to be easy. there is just not that much room to tweak it. its got EGR, SCR, DPF, multi-injection events per combustion cycle. the brits at rover who developed this are clever guys, they have squeezed a lot out of that CGI block already to get 400hp and 750# of torque out of it.