I recently bought a 1999 323i with hopes to hit the track drifting next summer. I'm not very familiar with bmw but have general knowledge on mechanics.
I found a rear diff out of a 1994 318 with a 3.91 gear ratio and lsd. Wondering what kind of work is involved with the install. Will I need custom driveshafts or any fabrication. If this isn't the right diff for what I'm looking for can someone point me in the right direction. Thanks guys !

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