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Quattro is a permanent all wheel drive system used on Audi brand automobiles. In the Quattro system, engine power is sent from the transmission to a center Torsen differential which splits it between the front and rear axles and also individually to the left and right wheels as needed by driving conditions. Under ideal conditions power is split 50/50 front to rear. But in extreme cases up to 67% of the engine's power can be directed to a single wheel.
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