I have a pd170. It has had the dpf gutted. I was unsure at first as it didn't smoke a lot and passed the smoke test at the mot with no issues. My first remap was a superchips bluefin. They do not map the dpf out or egr as it's against their policy. The map was good but the car still used to regenerate sometimes, and sometimes coasting up to a roundabout or side road in 2nd gear it would cut out. I never got it rolling road but it preformed well. The car didn't smoke at all with the bluefin.
I then opted for a shark performance map who are based in Mansfield. This map is much more aggresive then the bluefin although being a stage 1 it does smoke a bit when putting the pedal to the floor. I had to pay extra as well for them to map out the dpf which was a bit of a surprise but they did check it for me for free to find out if it had been gutted. I'm impressed with the map and i am opting for a stage 2 sooner in the year.
For them to preform a stage 2 they say you need to have a cat back exhaust + dpf downpipe/gutted and a decent panel filter. But this later changed to a performance air intake (car would breath better, so they say) however I know they were just trying to sell me one as they're there to make money.
The service was pleasant though the wait was a bit of a bore to be honest. I'd use them again as they do get good
reviews, just do your research and be prepared to challenge anything that someone will say you need when you actually don't.