From the point of evaluating second hand M3W's , is there an easy visual clue as to wether a Centa has been fitted or the original is still on ?
If i remember correctly "C1" should be stamped on the middle fin of the bell housing near to where the steering rack passes through it if it has the later centa drive fitted. I suppose this will depend on whether the person that did the job had his stamping punches handy though!!