-XDS mk6 is software
-XDS mk7 is software + LSD
XDS and the curent XDS Plus are always software only.
Mk.VI GTI came with this as standard and the lesser Mk.VI Golfs as an option
(at least in Europe). Even more, all M.VII do come with XDS as standard.
The Mk.VII GTI still uses XDS Plus as standard, while the Performance Pack has
the true mechanical Borg-Warner made VAQ/FXD LSD.
The Mk.VII R uses software XDS Plus on both axles. There is no mechanical lock
besides the Haldex.
I don't see any way to adopt MQB software options to a PQ35/36 based car.
Most of the electronic hardware are new developements. Would you ever try to
run Win8 on a Commodore C64?
There are options though. Wavetrac, Quaife and/or Peloquin make true LSDs for
4motion cars both front and rear. As already mentioned, there's also a modded
Haldex controler. I'd strongly prefer the mechanical diffs, esp. for the rear diff.
from what Ive read the MK7 R gets a upgraded Locking Front and Rear Differential? What will the Pros/ Cons of these upgrades mean?
The Mk.VII R is the first 4WD Volkswagen that comes with XDS Plus. The Mk.VI R
just had EDS and ASC, which didn't help on fast cornering at all.
VW may have done some smaller improvements on suspension kinematics, Haldex
and so on, but whatever they did, it works. The Mk.VII is noticably quicker on track.