The mechanical term "LSD" has been around for decades & refers only (in mechanics) to a Limited Slip Differential...this item fits inside the gearbox case, & is purely mechanical..
The VAQ unit is outside the gearbox case on the passenger side driveshaft & is electrical..pull the fuse & it won't work.....The VAQ units job is to cause the existing "open" type diff in the gearbox case to lock up by locking the driveshafts....& it relies on the ABS systems & uses the brakes to get around the "preload" situation & requires additional special oils at service time........go read the how it works guide that I wrote...
An LSD is 100% mechanical, fits inside the gearbox case as it replaces the basic "open" type diff.....& doesn't rely on the ABS or the brakes & has no electrics....also it runs only on the gearbox oil...do additional "special oils" come service time
Thats the thick sh1t marketing dept....
.....The people that make the unit, & the VAG engineers don't call it a LSD as the terminology is incorrect..again see my pervious post or my how it works guide...