the trick to diffs is "if it works, then run it"
the problem is that different cars, doing different things, setup differently, makes diffs complex. torsens work in a lot of applications super well. but in that one, it just didn't. i personally dislike torsens because they lock and unlock instantly, which to me defeats half the point of having a diff at all ... predictability. that being said the torsen in the back of my Mr2 works great, no issues.