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Is it legal to remove the DPF from a diesel car?

I've seen adverts for companies that can disconnect the diesel particulate filter from the car's ECU. Is this legal and does it make the car better? I think you said only in the last couple of years DPF have been compulsory on new cars so presumably on an older car it would be ok?

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It would have to be removed altogether or would just clog up and removal of DPFs make a car subject to failure in the new, more stringent MoT rules that came into effect on 1 January. Removing a DPF alters the cars emissions on which it is taxed so could even be construed by HMRC as tax evasion, if they had the time.
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