I own a 2002 Mini Cooper (R50), a Model Year infamous for its failure-prone 5-speed manual gearbox. When failure occurred I replaced the whole starter motor - flywheel - clutch - gearbox - axles assembly with one from a 2005 Cooper S.
To my delight, the gearbox version I got is a "BKL", meaning "factory fitted with limited slip differential". The difference it makes is so marked and pleasant (way faster around corners, grippier, more solid driveline feeling) that I got interested in the tech of LSDs / self locking differentials.
To my big surprise, I found NO source telling what type of LSD the one fitted on some 2005-2006 R53 MINIs is. I think it falls in the clutch-type category, but was unable to find any other kind of information, let alone a datasheet of some sort.
May you help me in learning more about the specific piece of hardware I have? It is a surprise to me that such a significant dynamic improvement fell "under the radar" of the enthusiasts...