Every vehicle I have tested with a fully operational DPF has had to have the RPM pick up used because the smoke meter would not sense the acceleration from the exhaust emissions, also every one has passed on the first acceleration as a fast pass.

On the other hand, I can't remember having to use the RPM pick up on NON DPF vehicles and have to carry out at least 3 accelerations.

So the way I look at it, removing the DPF will increase the particulate emissions, and that is the whole point of the system. It may pass a test and be within "Current" legal emission limits but is it legal? And what if come February Vosa reduce the limit from 1.5 to say 1.0 or less for Originally DPF equipped vehicles?

Graham