HD: MTM RS6 725 HP vs BMW M5 Sedan Evosport headers, Dinan muffler and aftermarket ECU: M5BOARD.com
http://www.m5board.com/vbulletin/e60-m5-e61-m5-touring-discussion/137368-supercar-shootout-2009-may-gtboard-com-lp640-lp560-4-m5-touring-m6-porsche-997-gt2-jaguar-xfr-e39-m5-ess-supercharger-more.html MTM RS6 725 HP vs BMW M5 Sedan Evosport headers, Dinan muffler and aftermarket ECU: M5BOARD.com
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