Went camping with my younger son and took the GTI up/down this road
https://www.total911.com/palomar-mountain-road-ca-usa/
It has super tight switchback, 10 and 25mph.
Diff is pretty impressive, no more 1 wheel drive with it. Still drives like fwd but just with full 2 wheel traction. Interesting since I cannot feel it working, basically transparent. I think a standard lsd you can feel when they lock up.