it will elimate diff twist at the back if you already have the subframe lock, but the front of the diff carrier has 2 bushes that you can also firm up with
these.
Basically the two arms that stick out to the side of the car from the front of the diff carrier will have OE bushes. the rings in the link sit neatly in recesses in those bushes which firms them up. The diff carrier should then be ridgid.
You can also go for solid mounts for the centre of the prop shaft to stop that twisting under launches, but I havent found those for sale anywhere yet