But the internal combustion engine is only part of the story. Attached to the car's seven-speed dual clutch transmission is a 161 horsepower electric motor, adding boost to the rear wheels and making the total system output 950 horsepower and 664 pound-feet of torque. Ferrari calls this system HY-KERS.
Energy from braking and extra torque gets stored as electricity into a 132-pound battery pack. Although the electric motor cannot drive the LaFerrari by itself, it provides extra boost for acceleration.