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Spied: Mercedes SL65 AMG Black Series Hanging Out With Next Generation Pagani Zonda

The guys at Fast Lane Daily caught the 2009 Mercedes Benz SL65 AMG Black Series hanging out with the next generation Pagani Zonda in the mountainous regions of Colorado, USA. Both cars were apparently undergoing high-altitude testing. So why would you have two supercars who are rivals at their own game testing together?