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Audi's traditional quattro system is the one they invented back in 1980. The main difference is that the manually lockable center and rear differentials have been replaced with torque biasing systems like the Torsen. The other one is really the VW (4 Motion) system and is used on cars that have a transverse 4 or 6 cylinder engine. Audi's system is used on cars that have normal engine orientations, like the normal V6's (as opposed to the VW derived VR6) V8's, etc. The Audi TT and A3 are built on the Golf chassis, more or less.
Ironically, VW has built cars that had engines with a north/south orientation and these cars used Audi's quattro system.
JR
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