The second-generation Audi RS6 was launched in September 2007 The RS 6's 5.0L V10 biturbo engine produced a stonking 571 bhp at and 479 lbf·ft of torque and an incredible 0-61.1mph in 4.6 seconds, its top speed is electronically limited to 155.3 mph, but a factory option was available to de-restrict the top speed 170.3 mph! As of January 2010, this outrageous estate was Audi's single most powerful car ever!

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