Quote:
Originally Posted by Zooks527
The xDrive uses a different rear differential than the RWD, with a welded ring gear instead of bolted. You can go with an LSD from Quaife or Wavetrac. Cost to put one into an xDrive ends up being about the same as the BMW LSD in the RWD. On the flip side, a Wavetrac LSD in the RWD is about a third of the price of the BMW one.
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I can get the BMW LSD for about 2k + install. Worth it to not have any warranty issues.