My D5 with 127k miles was well clogged up , I did get some enjoyment cleaning out the gunge thinking it would help and it was really bad but I cant honestly say its made any difference to performance or fuel consumption but my car has a lot of other problems as well so maybe on a car with everything else working as it should it does make a difference , I am about to remove the intercooler followed by the turbo to check for problems on mine and I even suspect the cat may be done . I think you can blank off the egr as its supposed to improve the power slightly but there is always a downside and that is the the egr duct gets blocked completely and causes more problems .
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