The Gen 2 has what looks like a resonator/muffler but is part of the SCR system. It might have a muffling effect but isn't really a muffler and couldn't be removed without the full "modification". I am guessing the DOC/DPF have enough muffling effect that it wouldn't make much difference to have a muffler downstream.Do the Gen 2 diesels have a muffler? The Gen 1 diesels did not have one.
I wouldn't hold your breath on being able to delete - thus far, there has been no delete made available for the Gen 2 - and that was before the EPA crackdown that saw the Gen 1 deletes become extremely scarce (and expensive). Tuning would be a major issue in deleting the Gen 2 - it's proving extremely difficult to crack.