m5board.com: Audi RS6 Avant (580 HP) vs BMW M5 E60 50-270 km/h
Audi RS6 (V10 BiTurbo) vs BMW M5 E60 w 20´ wheels: http://www.m5board.com/vbulletin/e60-m5-e61-m5-touring-discussion/127290-latest-gtboard-supercar-shootout-audi-rs6-lp560-4-997-turbo-997-gt3rs-m5-more.html#post1450866
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