That said - in 10 years I've never had to worry about a burn off but it does blow smoke. It runs pretty dirty and leaves a lot of soot on one side of the bumper.
I doubt (well, there's no doubt) that you have either a functioning DPF or SCR. You'd be plugged up. Whomever did the delete simply cored the filters like we used to do with cat converters. I'll bet it has a plate on the EGR circuit, as well.
It's fully deleted, mechanically, but left cosmetically "palatable".
