Compared to the coupe, the i8 Roadster will boast two humps behind the rear seats as seen on the i8 Vision Future Interaction concept. Overall, the design will be in line with its fixed roof counterpart. Some reports are indicating output of the hybrid powertrain consisting of a three-cylinder 1.5-liter gasoline engine and an electric motor will be taken to somewhere in the region of 372 horsepower.
