I have a folder called 2001 Nissan Frontier with lots of zipped professional service manuals, I believe the Navara is called the Frontier in some countries, I have found it useful in the past, may be a bit to old to be any use to you though.
Hahaha Dion, you are a brilliant man. I bet that's the exact question and here's the rest of us going "well yes, the electronic manual for the vehicle is in PDF format ..."
The answer then is "NO". Manual Navaras did not get a DPF fitted.
DPF = Diesel Particulate Filter.
PDF = Portable Document Format. Certainly a different beast!