I have no first hand experince with the 6.7, but where I am working on the pipeline, Cummins are the first choice with the majority a guys there. And have asked around the last few days since I first saw this thread, and there have been a hand full of guys running the Edge on the 6.7. A few of them have an exhaust to go along with the tuner but most of them are stock still and have said that they are going to wait to see what the tuners will do to the new engine and all the exhaust BS before chosing an upgrade. But most all owner are planing on doing aftermarket upgrades.