In its first iteration (type 104.000) the engine had a compression ratio of 8.5:1 and produced 105 PS (77 kW; 104 hp) at 5,600 rpm, giving the car a top speed of 190 km/h (118 mph).

Improved type 104.003 had different camshaft timing for 115 PS (85 kW; 113 hp) at 6,000 rpm; finally type 104.006 with an 8.75:1 compression ratio, revised camshaft timing and fuel system put out 127 PS (93 kW; 125 hp) at 6,600 rpm.

Top management were preoccupied with more run of the mill projects, however, and only 114 of the high-performance coupés had been produced by the time the cars were withdrawn from production in 1954.

[4] 34 of the cars had a factory produced bodywork by Fiat's Dipartimento Carrozzerie Derivate e Speciali ("Special Bodies Department").

Ghia had recently been sold by Boano to Luigi Segre, and a one-off Alfa Romeo 1900 had been built for a wealthy entrant in the 1953 Mille Miglia race.

An original un-restored car sold at a Scottsdale, Arizona Gooding and Company auction in January 2011 with a gavel price of US$1.55 million ($1.7M including buyer's premium).