The one-off racing car "Eldridge", derived from the old Fiat SB4 chassis, became known as Mephistofele for the infernal noise emitted by its powerful aircraft 6-cylinders in-line engine, giving a capacity over 20,000 cm3, not attenuated by exhaust mufflers kept “free” to provide the most significant performance. On 12th July 1924 in Arpajon, the Mefistofele, was able to reach, driven by its pilot and designer Ernest Eldrige, the amazing speed, for the time, of 146,01 miles per hour (over 230 Km/h) and broke the World Land Speed Record achieving an impressive result. The Mefistofele, was characterized by the high back bodywork able to contain the powerful Fiat A-12 liquid-cooled engine and for its structure especially made to achieve the speed record.