Could be down to which diffs you have, early D3 had 50/50 centre diff and open rear diff, later it got 40/60 centre diff, I think it was introduced at different times for different engines. Then a bit later it got an option for sport rear diff as well.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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