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Hi N4th4n did you ever find the cause of the knocking? I have the same car and in cardiff maybe there something in the water or diesel! :| had my injectors done foc by audi when there was no problem now the car feels slower and getting underboost issues! time to clean out the inlet and egr I...

Proud owner of my 2nd A4 looking at a few mods as i had the bug from my previous v6 quattro sport! Had help from this forum when browsing before so decided to join and give a little input of my own :)