reading the above, my st is 06 euro 4 type egr, its clean , had it off and wasn't bad at all, inlet also clean, toying with buying a blocking plate, 2 types, one for mine has a hole in the centre, is there a foolproof way of ensuring the EML stays off, is it only a workaround or does the ECU need reprogrammed, also i have heard that the 06 late build st diesel have a modded map from ford, is it worthwhile having this done by a ford garage or would i be better having it remapped by an expert, not looking for mega grunt, just power from dot like my old pd golf estate..