Here in the UK, BMW retrofit LSD is coming in at 3.5-4k GBP fitted depending on which dealer you talk to.
I have quaife [had them on previous cars]. 50% of the cost of BMW unit and v happy with results.
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Fettled M135i EB AT then AW M2 DCT - both gone but not forgotten:
Current '22 X3M LCI..
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