"Just saw this post, I'm surprised really that it's been possible to delete DPF's for so long in England without consequence. I'd have thought that the regulation nazis in Brusseles would've regulated this long before now.
Here in Germany, there is no chance of getting away with it: the TüV (MOT) just runs an immisions-relavent ECU check, which immediatly shows up any system tampering, and whether the DPF is there or not.
I don't know when they stopped doing the maximum RPM test, but it's a good while ago now. As other people have pointed out, with modern diesels it's a complete waste of time.
That's the main reason I got rid of my diesel: I don't do enough long runs to keep the DPF clean, and removing it is not an option with modern test methods."
I haven't scanned the ECU myself but I think it would be pretty obvious that DPF is not active. There are parameters which state the % clogged, probably last time a regen was carried out etc. Someone correct me if I'm wrong.