My advice legally has to be not to remove it because to remove it is technically illegal whether that particular EC Directive is enforced in the UK or not. I cannot legally advice people otherwise. Under Regulation 61A of the Road Vehicles (Construction and Use) Regulations 1986, it is an offence to use a car on the road that has been modified and, as a result of the modification, does not meet the emissions requirement that applied to it when new. This is likely to be the case if a diesel particulate filter is removed. Removing and replacing a DPF is not straightforward. Sensors, wiring and reprogramming the ECU will need to be taken into account.