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As the title says, I was wondering if it's possible to retro fit the sports diff, on my 2010 S4. Or do you need to have the other drive select packages.
Perhaps I would be better going and sourcing a quaife aftermarket lsd.
Hmm, have I just answered my own question. lol.

Quaife and sport diff work differently

It would be cheaper to sell your car and buy one with sport diff than to retrofit.