Lamborghini Sian Roadster, Audi Q4 Sportback E-Tron, BMW M4: This Week’s Top Photos

Lamborghini launched an open-top version of its 807-horsepower Sian supercar, and with just 19 destined for production the aggressive roadster is even more exclusive than the coupe. Keep the accelerator floored and the car will eventually top out somewhere around…