Track Battle: Mercedes-Benz CLS63 AMG vs. Porsche Panamera GTS

There is a 120-horsepower chasm between the 2014 Mercedes-Benz CLS63 AMG and the 2013 Porsche Panamera GTS that you are about to see in the Fifth Gear track battle below. Which car will be victorious? The Mercedes with its 550-horsepower biturbo V8, or the Porsche with a relatively puny 430 horsepower V8? This may seem like […]
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