You're unlikely to feel much benefit from a LSD in my opinion. The only time I find one would be useful is when pulling out of a junction with lots of lock on.
On a track I've never found traction an issue, with the back (either wheel) only breaking away at high lateral loads, at which point both wheels tend to go at once.
An example from today at ~95mph on a cheapy airfield day:
http://www.youtube.com/watch?v=rRUPK...etailpage#t=95