1080p: Audi RS6 Avant vs BMW M5 with ECU and aftermarket muffler (Dinan)
http://www.m5board.com/vbulletin/e60-m5-e61-m5-touring-discussion/128188-video-2nd-bmw-m5-sepang-bronze-dinan-exhaust-aftermarket-ecu-vs-audi-rs6-avant-580-hp-stock.html 1080p: Audi RS6 Avant vs BMW M5 with ECU and aftermarket muffler (Dinan)
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