Porsche is the world 's largest manufacturer of racing cars ; the Porsche 911 GT3 Cup race car competes in the Mobil1 Supercup which supports Formula One Grand Prix .
The Mobil1 Supercup is the world 's fastest international one - make Championship .
Porsche is the world 's largest manufacturer of racing cars ; the Porsche 911 GT3 Cup race car competes in the Mobil1 Supercup , the world 's fastest international one - make Championship , which supports Formula One Grand Prix .