In 1975 the X1/9 was chosen by Dallara to enter the World Championship for Makes in the Group 5 Special Production class. The Dallara Icsunonove (the Italian pronunciation of "X1/9") featured a modified X1/9 engine with a custom 16-valve cylinder-head (up to 190bhp) and fundamental suspension and body/monocoque alterations, the most obvious of which are the massively flared wheel-arches and the oversized rear wing.