If youre a regular TopSpeed reader, then youre no stranger to what the 2020 Mustang Shelby GT500 can do in a straight-line race. Weve covered a lot of situations where the muscle car destroyed its peers in a drag race or it bravely held its ground in front of the likes of Ferrari 812 Superfast and Porsche 911 GT3 RS, even on a twisty track. This time, though, the GT500 found its match in the McLaren 720S. Not only that, but the GT500 youre about to see getting a beating (repeatedly) from the Macca isnt running on stock gear, as it has been modded to churn out 800 horsepower.