Audi Sport Quattro concept highlights 30 years of tech progress - CNET

At the upcoming Frankfurt auto show, Audi will show the Sport Quattro concept, not only a 30-year anniversary marker for its original Sport Quattro, but an illustration of incredible technological progress.

Frankfurt 2013: Audi Sport Quattro Concept - Video - CNET

Audi Quattro concepts - Video - CNET

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Audi Quattro concepts - Video - CNET

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Audi Sport Quattro concept highlights 30 years of tech progress - CNET

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Audi Sport quattro Concept May Still Spawn Production Version: Report

Frankfurt 2013: Audi Sport Quattro Concept - Video - CNET