Grand Prix of Baltimore adds Porsche GT3 Cup Challenge

The 2013 Grand Prix of Baltimore will host events from GT3 Cup Challenge, a North American racing series between Porsche 911 GT3s cars.

The GT3 Cup Challenge, sanctioned by the International Motor Sports Association, will run along with the American Le Mans Series and IndyCar Series races during the Labor Day weekend event. The 2013 Grand Prix of Baltimore is a three-day event scheduled for Aug. 30 to Sept. 1.

Semi-professional drivers in Porsche 911 GT3 Cup cars compete in GT3 Cup Challenge. Baltimore…