Not too sure about blanking the EGR being a criminal offence in the UK? Would like to be pointed toward some real evidence of that...
And not too sure why blanking the EGR would "contaminate the CAT and DPF" when one of the main reasons to blank off the EGR is to stop the exhaust gases gunk going back through the engine. Have you ever seen the inside of an EGR valve? Soot blocks a DPF, that is reduced with a blanked EGR.
There is approximately a 1-3% fuel saving when an EGR is blanked, and the black smoke from soot is reduced because the fuel burns more efficiently.
I do understand that most people like to keep their cars unmolested and well maintained and that is fair enough. Cleaning an EGR is important if you do want to keep it.
However, it is not there because it's good for the engine! It's to do with emissions. If you've done much travelling around the world you will probably come to the realisation that not many countries are so anal about emissions.
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