The space frame 2500 GT was introduced in 1963 Paris Motor Show. Designed by Franco Scaglione and engineered by Carlo Chiti and Giotto Bizzarrini the car was built only in limited numbers before investors withdrew financial support and the project collapsed. The car's drawings were later used for Count Volpi's (an early backer) failed Serenissima sportcars project. A Moreno Baldi attempted another revival of the ATS concept in 1970, and failed even more disastrously.
With its 220 bhp (164 kW) (210 bhp according to some) and 255 N·m (188 ft·lbf) of torque it was claimed to be capable of top speed 240 kilometres per hour (150 mph). A competition version (ATS 2500 GTS) produced 245 bhp (183 kW) but never amounted to much. The decent looking body was by Allemano, and the 5-speed transmission by Colotti.