Got the second hand AG injectors from an a5 3.0 tdi and fitted them today, took about 3 hours all in, coded fine and white smoke has dissapeared :) feels a lot better but I think it needs some cleaner running through it as when removing old injectors the combustion chambers seemed quite coked up from the long term poor combustion, all in all though I'm a happy chappy :) and for a damn sight less than getting new ones.