We hit the streets of Birmingham and the test track to see which is best – the Mercedes S63 AMG coupe or the Porsche Panamera Turbo S.

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Pro driver Randy Pobst hot laps the 2014 Porsche Cayman S around Mazda Raceway Laguna Seca as part of Motor Trend’s 2013 Best Driver’s Car Powered by Mobil 1 (https://www.youtube.com/user/Official…). The 2014 Porsche Cayman S is one of 12 contenders competing for the title of 2013 Best Driver’s Car.

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