So as engine speeds rise, more and more combustible mix is drawn into the engine. The result is roughly twice the power from a given displacement. The first drawback has been banished by all makers, who learned how to cool and lubricate the beast. The second remains a point to ponder, but not in this car. One would be hard pressed to identify the S6's powerplant as a heavy breather.
Throttle response is virtually instantaneous across the rpm range.
The rush of power can still be felt under heavy throttle as the tach needle climbs past 4,000, though. Only ears not dulled by rock concerts could pick up the characteristic turbo whine. The turbo confers the additional benefit of smoothing the otherwise ratty exhaust note typical of fives. Not only is power delivered in varying degrees to front and rear axles, each axle has an electronically controlled limited-slip differential. As much power as possible goes from engine to pavement seamlessly and unfailingly.