+1 for Jonney's advice. Don't worry about the EGR tube, once you've blocked it you can forget it. As for the black oily stuff in the hot pipes and intercooler, you can fit a catch can and then wash the intercooler out (wash with petrol, allow to dry or an hour before reinstalling). Catch can fitting should take about half an hour in an equipped workshop, one hour at home, 6 hours if she's not wearing enough clothes and beckoning you inside, and 24 hours if you've invited mates over to help and they bring slabs of beer.