which is the name of the most famous audi sport car?
Possibly the Audi Quattro, because of its revolutionary quattro drivetrain and its success in rallying. Or possible the R10 because of its success in ALMS, despite (or on account of) being a diesel.
Audi Sport Quattro S1. The king of rally. http://upload.wikimedia.org/wikipedia/commons/3/37/Audi_Quattro_-_2007_Rallye_Deutschland_(cropped).jpg
Don't forget about the Auto Union Type D race car from the 1930's. http://en.wikipedia.org/wiki/Auto_Union#The_Auto_Union_racing_cars http://www.supercars.net/cars/122.html http://www.ddavid.com/formula1/auto_d.htm
the S1 of course
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