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Back when Audi was building German army vehicles similar in structure to the American Willys Jeep, engineers at Volkswagen made some serious improvements to their version of Audi’s creation. Audi’s research head at the time quickly realized that the VW variant was capable of much better handling than the Audi build, which lead them to a complete overhaul of the driveshaft. Their new hollow shaft, mounted next to the main driveshaft, allowed the car to shift torque to the outer wheels in cornering, effectively keeping the torque consistent. This breakthrough was the birth of the famed Audi Quattro.