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Audi has stayed quiet about its Sport Quattro Concept since the 700-horsepower, tangerine rocket debuted at the 2013 Frankfurt Motor Show – a followup to Quattro Concept shown at the 2010 Paris Motor Show. Now, Audi has broken the plug-in hybrid out to give thanks to its Facebook fans, which now number over 100,000 strong (103,123 as of this writing).