Les I think you are right. I have blanked off the EGR and redeemed a bit of power and almost no smoke at all. I think I have to clean out the whole system ( intercooler, manifold ) from severe Marmite contamination, ( I am a Marmite hater anyway ) but the severe lack of power still worries me, am I looking at the wrong place as its nice to have a new turbo but I obviously need advice. Thanks Paul.