M xDrive 4WD Sport Vs Quattro Ultra - 4X4 System - BMW vs AUDI

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BMW M5
The M xDrive system includes the turn-tackling 4WD—a first for the M5, along with the speedy, drifting 2WD, and 4WD Sport, which provides a perfect combination of delicacy and discipline
https://goo.gl/1ptyfn

Audi Q5 quattro Ultra
Maximum efficiency with the New quattro Drive System / Ultra Technology
https://goo.gl/ySUUdp

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