The 2013 Audi RS5 Cabriolet will retail for $77,900 and will go on sale sometime next month. It shares the same V8 4.2-liter naturally-aspirated engine as the coupe, which produces 450 hp and goes from 0-62 mph in 4.9 seconds. Audi says the RS5 Cabrio can return an EPA-estimated 16 mpg city / 22 mpg highway / 18 mpg combined. But for an additional $6,000, customers can opt for a high-performance braking system with ceramic front brakes. While driving at speeds of up to 30 mph, the soft top can be opened in 15 seconds or closed in 17 seconds.