I would agree with McBroom. I've owned both a 6.4L HEMI & a 6.7L CTD.
I looked at a diesel system and noticed that it wasn't going to fit without some new hangers and pipe mods at the back of the DPF SCR can.
What I did with my 6.4L to remove that ugly reso & tailpipe was to keep the stock pipe at the muffler, have a Magnaflow muffler installed, removed the reso & tailpipe, had a new full length tailpipe fabbed and the tailpipe was painted matte black to hide it.
Without a reso it droned a little bit. I had already planned to get a custom tune from Hemifever so I had him turn off MDS and the drone pretty much went away.
Here's a vid of how it sounded: