 In 1953 two of them were modified to carry out further aerodynamic tests.One was given a fixed roof, becoming an enclosed coupé; the other, doing away with the characteristic bulging wings in favour of more conventional ones, became the so-called ""fianchi stretti"" (Italian for "narrow hips") spider.The latter car was the only Disco Volante to be raced in period—being fielded in some competitions during 1953—since the program did not progress past the experimental stage.