I have a Koala Motorsports performance diff in my 135i. I am thinking of selling the car and thought someone in the NE area may want to swap diffs + cash. This is what I have:
I am asking $1250 cash plus your diff. The swap could be done in someones driveway in a few hours or the shop that swapped it in charged $300 before. Whoever buys it would be responsible for any charges or sweat/labor for swapping. This diff cost me well over $3000+ so I think this is more than fair. It has approx 62K miles on it and the fluid has been changed regularly. It was in my 335i and I had it put into the 135i (same diff).
Let me know if interested...