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t0nkatracker
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this one shows quattro written in lowercase on the car: http://www.imcdb.org/vehicle_162397-Audi-quattro-Typ-85Q-1983.html
as does the rear of the Concept:
http://www.auto-types.com/images/_autonews/Audi-Quattro-Concept-2010-details_98.jpg
but this ad lists it as Quattro in the text of the ad even though quattro is shown on the license plate, of course it is also written QUATTRO so who knows
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http://24.media.tumblr.com/tumblr_liizqxWFGL1qd1ngco1_500.jpg