As a direct competitor to the Mercedes E63 AMG and BMW M5, Audi is planning to offer the RS6, the estate variant of which is seen here undergoing final tests in the southwest of the U.S.
The bigger air intakes in the front bumper, the wider fenders and the diffuser at the rear are the key clues. While the S models have four round exhaust pipes, the RS models will receive oval pipes as their distinguishing feature.
Powered by the same V10 engine as the S6, but with some help from twin turbos, claimed power is 580bhp This Audi will give the M5 and E63 AMG a strong challenge. The RS6 will debut in Frankfurt in September this year.
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