I left the cat alone- (gets rid of the teary eyed stink) unplugged the EGR valve, cut the DPF in half lengthwise gutted it, installed a piece of 4" pipe with a few hundred holes in it, wrapped it tightly with fibreglass insulation and welded it back up. Poor mans glass pack muffler and keeps truck " in stealth mode!" The delete tunes work great and no problems over last 2 years!
I did the same except for simply knocking the insides of the DPF out with a long crow bar. I do get very slight drone at certain speeds, but not enough to bother me or my wife. Am curious if you have that, though.