It basically appears to be a gear type differential similar to a Torsen, Quaife etc. with the major difference that it has the ability to account for loss of traction by a single wheel. Clutch type diffs also handle this situation just fine, however I imagine that this diff might be a little quieter and smoother on the street.
It is a USA made product. Should be able to order through one of their dealers or order online the "export" part. Nissan Motorsports USA might simply be acting as a reseller for the local market.
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