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I have just fitted a egr block to my crd about 3 weeks ago, So far the boost hasn't changed max boost of about 16psi on pod gauge and the fuel economy seems to be about the same around town, haven't had a chance to do a motorway test yet. But i have noticed egt are a little lower at 100kph , just under 350" I did drill a 10mm hole in the blank plate before fitting ! and so far no error code :-)