the helical diffs dont like lots of power. the ware out. especaly if you use a lsd oil in them. the way they work is the gears inside are forced hard against the casing when the lsd action is required. its this friction thats gives the lsd effect. basicly the gears are alot harder than the casing so the casing just wares away and eventuly the gears fail or it will just open wheel.
there a good diff but need to big to last. unfortionatly the r200centre isnt that big. so for lots of power it will behave like a mint viscouse dif then die.