Update from my dealership:
They've had my truck all day and put it up on a lift next to another GT. They confirmed that the large stamped "C" numbers were different on the muffler and 1 resonator but somehow could not find an actual part number (even though I told them where it was and included a picture of it). Everyone agrees my exhaust doesn't sound right, but because they couldn't find the part number stamped anywhere, they think that there is a "quiet" and "loud" GT exhaust system...
They are now waiting on Ram Canada (or whatever you want to call them) to advise them on how to go forward... I've asked them to put both trucks back up on the lifts and compare the part number that is engraved on the pipe that is welded to the front of the muffler (not sure how I can be more specific without doing it myself) before I pick my truck up tonight.
will continue to update as I find out more.