Those DPF's are hard to come by now. My brother-in-law owns a diesel shop and apparently can get them from up north (canada). I think he quoted like $2000 out the door for a 2011 Cummins the other day. That was with the exhaust piping, flash, and install. I have the good 'ol 7.3 with a cat-less MBRP 4" turbo back, an intake, and TS Performance 6-position custom chip good for up to 140hp. Shift on the fly is way better than the SCT flash tuner I used to have.
What if the hokey pokey really IS what it's all about?!