The rare shot shows a pair of delectable supercar test mules – the next-generation Pagani Zonda and the new Mercedes SL65 AMG Black Series – undergoing testing side-by-side on public roads.

This Pagani Zonda does not have a powertrain, but it weighs as much as a car that does. The Pagani Zonda Carpincho was the head-turner of the weekend. Commissioned by car collector Jorge Gomez ...