The BMW M3 has long reigned as the king of the sports sedan segment. However, two new challengers have arisen: the Cadillac ATS-V and the Mercedes-AMG C63 S. The Cadillac was honed on the Nürburgring, and with its twin-turbo V6, packs 40 more horsepower than the M3. The mighty AMG, on the other hand, is based on the brand new ...

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