If i had to guess Dinan came out with the LSD now because its using the same one from the M5 but marking it up 300%
You guys should look into this before spending the money.
Current - 2013 N55 535xi Msport SAT
Retired - 2009 N54 335i Msport 6MT
Retired - 2000 M52TU 323i ASA Supercharged 5MT
More Photos of my car here