While BMW makes plenty of machinery to keep ... of 500 horsepower – far more than the existing i8's 228-hp turbo three and 129-hp electric motor – dropping the 0-62 time down from 4.1 seconds ...

BMW said late last year that it would debut a production version of its battery-electric i3 four-door next year and would start making the plug-in hybrid-electric i8 two-door sports car in 2014.