When it comes to making an impression on the automotive world, most manufacturers have their own signature piece of engineering that sets them apart from the others. Porsche has its legendary flat-six engine, while Subaru has its Boxer powerplant to shout about. Then we come to Audi, which has made waves over the last half-century with its revolutionary quattro all-wheel drive system. AWD was pretty much reserved for off-road vehicles in the late 1970s, but Audi showed the world that it could bring pace and stability to performance cars.
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