Personally kept away from DPF removal. Can see removing one at say 2 years old then at 3 at test time who's back at me if the vehicle can't get through emmissions especially when the pass limit keeps dropping.
Or each time MIL light comes on - well you removed the dpf & it must be something to do with that & on & on...........


The other thing I have seen some vehicles with DPF removed & how would you tell if you did not know, apart from if the dpf case as been welded back up.
Probabaly ends up like SRS lights, if it's on it's a fail or if it doesn't light up it's a pass..
So if there is a dpf case then assume it's fitted...