It was an innovation that involved the replacement of the massive wooden door-pillars, connecting the belt line and the soft top and supporting the windows of the cars, with thin nickel silver uprights that allowed a significant increase in the glass surfaces.

Thanks to these earnings, in 1931 the company changed its name to "Carrozzeria Viotti SA" and moved to a larger warehouse in Corso Stupinigi to satisfy growing demand, using Fiat chassis.

Also on the basis of the Isotta Fraschini 8A S, Viotti created a blue convertible with red interior expressly for Gabriele d'Annunzio, a car still preserved today at the Vittoriale.

The company is of great importance in the history of the automobile for having created the Fiat 1100 Giardinetta which marked the birth of the modern station wagon; this solution was then also replicated on Lancia and Alfa Romeo chassis.

After the death of Vittorio Viotti in 1956, the body shop was overwhelmed by the crisis that hit the manufacturers of derivative cars and closed its doors definitively in 1964 .