The only way to reliably 'convert ' is to remove the open differential guts, remove the ring gear (which is welded onto the factory differential) and install a Quaife, WaveTrac, Drexler, OS Giken or some other reputable differential) into the Diff housing and reinstall.
FYI Drexler makes the M-Performance differential that BMW offers for these cars.
Quote:
Originally Posted by abouzaki
Can the installed open def be converted to an LSD
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