i've driven 2 4G93s
1) KAAZ LSD
2) PowerZone LSD
result:
1) Kaaz is very agressive! go in corner, power out and the car pulls into the direction you're steering. (LOVELY!!!!) -RM3000+ not including labour. LSD oils + regular maintainence!
2) PowerZone's LSD is milder, you can feel it work, no more *nge-nge-nge* feeling (of the diff slipping) slippage when you power out of a corner. You can feel the pull! and definately faster than stock diff. (actually my SLK's one very agressive! initial wearing in time, bite little, but after wear in, the driver's being yanked around (agressive!) but settled down and gave good but not so violent bite after that.
+cheap, low maintainence +any car can have an LSD now
-not as agressive as you'd wish