The 3.7 sec 0-60 and the 12.1 sec 1/4 mile were achieved using launch control. Probably the AWD + pre-spooled turbos makes the difference but you would think if the 550i xdrive had launch control, the result would be the same. All the Audi fans are going nuts saying the S6 is now neck and neck with M5 based on this one test and are sure the engine is pushing 500+ HP. I am interested in seeing some other head to head comparisons of the S6 to 550i xdrive.
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