It's the 30th anniversary of the 500 E, the Mercedes-Benz that Porsche built

AMG is rightfully regarded as the performance arm of Mercedes-Benz, even going back to the 1970s before the mothership took control of the little tuner shop. But for a brief moment in time, rival German automaker Porsche helped develop and build a Mercedes-Benz performance car. It was the 1991 Mercedes-Benz 500 E, and it's celebrating its 30th...