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The Audi TT Ultra Quattro concept is a study developed for next month’s annual gathering of Audi enthusiasts in Wörthersee, Germany, but it demonstrates how an intelligent mix of materials can bring about considerable weight savings even in existing series-production models. The show car tips the scales at a lean 2,449lbs, an impressive achievement considering it combines its potent petrol engine with Quattro all-wheel-drive. The result is a highly impressive power-to-weight ratio of 279PS per ton, a blistering 4.2-second 0-62mph acceleration time, and a top speed of 173mph. For more information please visit Autoblog.

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