REMOVING ANTI-POLLUTION SYSTEMS
As it is illegal for any motor vehicle to be modified in a way that it can no longer meet the emissions standards set when it was new (as enshrined in the Road Vehicles Construction and Use Regulation 61A), you can be prosecuted for driving a car on the road with any parts of its anti-pollution systems disabled. This includes the DPF, the catalytic converter and EGR valves. Even if the car passes its MOT, this does not sanction any illegal alterations.
Certain garages and tuning businesses still offer EGR and DPF removal services, for example, and some detractors have claimed that it is legal for the operation to be carried out, despite contrary statements made in Section 42 of the Road Traffic Act, referencing breaches of Construction and Use and Regulation 61.5(b) of the Road Vehicles (Construction and Use) Regulations 1986.
It will be interesting to follow any future judgements on this issue to see if any trader is taken to court. Regardless, we advise you not remove any emissions control equipment and strive to keep the original equipment
in good working order.