2012 BMW M5 Concept
If you thought the other luxury car makers were going to take the CTS-V's claims of "fastest production sedan in the world" lying down, you haven't been paying attention. Soon up to challenge the Caddy's reign will be a slightly tweaked version of the 2012 BMW M5 Concept ($TBA). Powered by a high-revving V8 with M TwinPower Turbo Technology, the new M5 will crank out copious horsepower to its seven-speed, double-clutch transmission, with the Active M Differential sending power to each rear wheel independently based on traction, slip angle, and other considerations. Nürburgring tested, Uncrate approved.