Supercar shootouts are a necessary evil, without it any supercar will lead a very dull, undramatic life. In fact the very DNA they are made out of would be entirely different if it weren't for shoot outs. Most major manufacturers go to the extent of buying a competing supercar to dissect it so as to learn its secrets, improve it, install it in their own car and call it their own technology. Think Nissan GT-R, shoot outs and demolishing the competition is what its made for.
But nevermind that, back to shootouts. The boys from American magazine Motor Trend recently pitted not two but three supercars against each other, they're all German and they all command a formidable slice of the supercar market, they are the Porsche 911 Turbo vs Audi R8 5.2 FSI, and the Mercedes-Benz SLS AMG. The guys got the California Highway Patrol to close down a section of road in Las Vegas and let loose. Great video, about supercars that is.
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Source: Motor Trend