Yes, if you are running a Torsen type diff (which the Wavetrac, Mfactory, and Quaife ARE), it is one of the better fluids out there, overall, for our IB6 transaxles.
The clutch plate type diffs (Drexler, Gripper, Cusco, KAAZ, OS Giken, etc.) are a little tricky since most of them require a friction modifier additive to be added to the transaxle fluid if it is not already present in it on the shelf.
Most gear oils in our specced weight/viscosity range do not have this additive in them from the oil companies.