I'm guessing (just like he is) that he's talking about the Diesel Particulate Filter.
While many people take theirs off and replace it with a straight through pipe, there isn't one available for Peugeots, the original filter has to be opened up and modified.
Google "Planet owners map" for details of competent Peugeot owners with diagnostic equipment and experience to help you.
Down on power could be due to a faulty MAF sensor. A failed one won't put the car in limp mode or put the engine light on.
But they're not cheap, so get a diagnostic to confirm its faulty before throwing parts at the problem.
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