Though Audi does already have the S4, the most powerful A4 variants will be the RS4 variants the German manufacturer is currently testing at the German Nürburgring race circuit. The car will be equipped with the bigger RS6's 450-HP 4.2-litre V8 biturbo which can be expected to catapult the car to 100 km/h in less than 4.5 seconds! Mind you: a Ferrari 360 Modena needs about the same time...
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