The Exelero was based on the Maybach 57. However, the twelve-cylinder engine used in the Maybach sedan was not powerful enough for the envisaged top speed, despite its two turbochargers. Therefore, displacement was enlarged from 5.6 to 5.9 litres, and turbocharging was optimised. As a result, a power output of just under 515 kW (700 hp) and torque of around 1,000 newton metres were measured on the test rig – enough power for the car to reach the targeted 350 km/h mark.