Quote:
Originally Posted by Gangplank
As noted the 135i comes with an electronic differential and an LSD is not a factory option. You can get an aftermarket LSD for $2500 and from what I've read here guys seem pretty happy with the upgrade. The 1M differential is not a direct swap.
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You could also put in the diff and subframe from a loaner E9x M3 or is it not that easy?