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Here is some background on the OSG.
http://www.n54tech.com/forums/showthread.php?t=6058
This diff has 20 clutch plates (10 on each side). The average clutch diff has maybe 4 per side
Also attached is a pic showing how the clutch plates on the TCD are precision machined with oil holes throughout. This actually turns the diff into an oil pump which circulates the oil through the diff and also retains oil on the clutch plates for quiet operation even when cold.
TCD is a higher end and more expensive version of the Superlock
An article comparing some other diffs with the Superlock.
http://grassrootsmotorsports.com/articles/whats-diff/
The part numbers for the e92 335 are as follows:
BM531-HC _TCD
BM531-HA _Super Lock