I would think the internals would be fine. I'm sure Ford didn't want a stock turbo making 650rwhp. If it was capable they know guys would run them at the level. Either way pretty amazing these 6.7l are making that kind of power this early.
Put it this way, none of the big 3 would make the newer trucks to be any less of a truck than the previous model, by rights. Take for example the evolution of the diesel trucks and diesel market since the mid 90's. First the 7.3, then the later 7.3s, then the 6.0 (which really doesn't count reliability-wise LOL), then the 6.4, now the 6.7. During all this time, the powerplants on each new design has been capable of more and more power with each new design. Comparing apples to apples, put a chip/programmer, intake, and exhaust on each truck. The 7.3's were what... 300 some odd horse tops?!? Then the 6.0s were capable of mid 400s, then the 6.4 would make 550 on fuel alone! Now why would they build the new 6.7 with a new turbo design and have it only support 580ish horse when it could support 650-700? Of course they don't want those of us in the aftermarket world to do this to their trucks because of course it is going to cause them warranty headaches, but they know we will. Ford, GM, and Dodge are all trying to encode and lock up the ECM's so we can't mess with them... They are getting smarter... but so are our tuner guys in the aftermarket world! Until the big 3 all hire Genius German Engineers, our backwoods need-for-speed hotrodding tuner guys will be right there... breaking into the sophisticated ECMs of these new trucks! Keep up the good work guys!:thumbsup