the sián fkp 37 is based off the aventador, and shares its 6.5 litre lamborghini v12 engine with the aventador. the sián also has an electric motor, which adds another to the car’s horsepower level. the v12 makes in the sián. the total power output of the car is . that makes it the most powerful lamborghini ever made. the engine is paired with a version of the aventador’s seven-speed automated manual transmission. the sián sends its power to all four wheels through an all-wheel drive system.