I have just acquired a 2006 E90 318i 6speed petrol and I would like to put in a second hand diff but I am finding it hard to find one that is so called compatible, I see many for a diesel or 2.3 or 3 litres. I am not to worried about originality or performance would not one of these diffs do. I just want a quiet ride for not to much money. I live on the Isle of Wight and only do about 3k a year. Can any body help thanks DaveU.