I'm tempted as well... went for a tour up north over a few days and noticed the rear wheels spin quite a bit as if it has an open diff without any electronic locking.
I still don't quite get how you work out which one you need? I have an E91 build dec 07 with steptronic. I understand there is a large diff and small diff?
Also I was told to ask does the deal come with the oil seals for the half shafts. I was told these are about $90 a side from BMW so sounds like it would be good to get with the package if possible.
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