As someone said above, this is actually a really good price concidering it's a factory BMW product. If I understand correctly, this diff comes as a whole (pumpkin, LSD unit, Ring & Pinion, etc) all in one. So it's just a straight swap. Not bad at all. Most LSD's will cost north of $4000 to do properly (a good one that is).
30% is fine for the street.
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