Like its fixed-roof counterpart, the 4C roadster will use a turbocharged 1.75L four-cylinder driving the rear-wheels via a dual-clutch automatic transmission. Alfa Romeo isn't revealing the specifics of the turbocharged four, but previously reports have suggested the mill will develop at least 300 horsepower.
Alfa Romeo is targeting a curb weight of just under 2,000 pounds for the 4C coupe, but it remains to be seen if the Italian automaker will be able to make that goal with the 4C convertible. Most drop-tops require additional bracing, so the 4C convertible will likely breach the coupe's one-ton target.
However, early development of the 4C convertible was handled by Italian race-car specialist Dallara, so the roadster should nearly match the performance figures of the coupe. Expect the 4C roadster to make the sprint from 0-60 in under five-seconds.
According to Autocar, the 4C convertible will go on sale in either late 2014 of early 2015. Pricing information for the Alfa Romeo 4C convertible is still years off, but the car should arrive with a price tag under $50,000.