Spy Shots: 2006 Audi RS4

Developing a maximum output of 420 bhp, the V8 revs up to a speed of 8250 rpm. With its displacement of 4163 cc, this outstanding engine exceeds the magical barrier of 100 bhp per litre truly outstanding in a production saloon. Maximum torque of 430 Nm comes at 5500 rpm in this very compact engine, with 90 percent of the engine's torque consistently available between 2250 and 7600 rpm.

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