AMG Locking Differential option?

So, I went to the MB-AMG Web site and noticed that it does in fact list a "locking differential" as a dealer-installed (I believe) option on the C63 (but I'm not sure if this is for the U.S. or not)...
http://www.mercedes-amg.com/#/c-63-amg
Just out of curiosity (not that I'm doing anything anytime soon, but...), can anyone confirm this and if so, does anyone know the cost of the diff. + labor?

So, I went to the MB-AMG Web site and noticed that it does in fact list a "locking differential" as a dealer-installed (I believe) option on the C63 (but I'm not sure if this is for the U.S. or not)...
http://www.mercedes-amg.com/#/c-63-amg
Just out of curiosity (not that I'm doing anything anytime soon, but...), can anyone confirm this and if so, does anyone know the cost of the diff. + labor?

I guess coming from a high TQ tuned BMW 335i (w/ approx. 440 lb.-ft. TQ) with an open diff., it's not that the LSD is absolutely needed, but I've been told that it helps the launching capabilities.
I guess coming from a high TQ tuned BMW 335i (w/ approx. 440 lb.-ft. TQ) with an open diff., it's not that the LSD is absolutely needed, but I've been told that it helps the launching capabilities. 
Quaife makes very good differentials.... they require a lot less maintenance and are built of solid quality.
Quaife makes very good differentials.... they require a lot less maintenance and are built of solid quality.
Also, what's the typical cost for a Quaife diff?
i love whiping turns and playing around i have 20k miles on my car i got the Quaife instaled when i had 15k and the last 5k its been nothing but fun fun fun and more fun. and yes traction improved alot.
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I guess coming from a high TQ tuned BMW 335i (w/ approx. 440 lb.-ft. TQ) with an open diff., it's not that the LSD is absolutely needed, but I've been told that it helps the launching capabilities. 







