Originally Posted by whitetiger
^the 07-09 spec b has the torsen R180 rear LSD.
That would actually make the 07-09 Spec-B slightly less sensitive to tire size differences, then.
A VLSD will catastrophically fail with a long slip duration (the fluid will shear, break down, overheat, and the plates will either weld themselves together or the housing will burst apart). Regardless of input torque, you will ALWAYS be ruining the diff.
A torsen-type unit will simply freewheel the planets when no torque is applied to the diff, and will attempt to speed up the slow tire when there is a torque applied. You'll notice the car handling funny before any real damage can occur.