Vignale's open barchetta version was also an innovative design whose recessed headlights and side vents became a Ferrari staple for the 1950s. 0334MM was the sole chassis with Vignale Berlinetta body, distinctive for its triple portholes on the bottom of front fenders, not on top. The 250 MM's wheelbase was longer than the 250 S at , with the coupé heavier than the barchetta. The V12 engine's dry sump was omitted from the production car, and the transmission was reduced by one gear. Power was increased to . The four-cylinder 625 TF and 735 S replaced the V12-powered 250 MM later in 1953. The 250 MM's race debut was at the 1953 Giro di Sicilia with privateer Paolo Marzotto. A Carrozzeria Morelli-bodied 250 MM barchetta driven by Clemente Biondetti came fourth in the 1954 Mille Miglia. 250 Monza The 1954 250 Monza was an unusual hybrid of the light four-cylinder 500 Mondial and the 250 line. The model used the 250 MM engine in the short-wheelbase chassis from the 500 Mondial. The first three used the Pinin Farina barchetta shape of the 750 Monza and 500 Mondial. One more 250 Monza was built by Carrozzeria Scaglietti, an early use of the now-familiar coachbuilder. The 250 Monzas failed to gain much success and the union of the Monza chassis and 250 engine was not pursued for some time. 250 Testa Rossa The racing 250 Testa Rossa was one of the most successful Ferrari racing cars in its history, with three wins at Le Mans, four wins at Sebring, and two wins at Buenos Aires. One example sold at auction for a record-breaking $16.39 million. 250 GTO The 250 GTO was produced from 1962 to 1964 for homologation into the FIA's Group 3 Grand Touring Car category. GTO stands for "Gran Turismo Omologato", Italian for "Homologated Grand Tourer". When new, the GTO sold for $18,500 in the United States, and buyers had to be personally approved by Enzo Ferrari and his dealer for North America, Luigi Chinetti. In May 2012, the 1963 Ferrari 250 GTO chassis number 3505GT sold by an auction for US$38,115,000. In October 2013, the 1963 Ferrari 250 GTO chassis number 5111GT sold by Connecticut-based collector Paul Pappalardo to an unnamed buyer in a private transaction for US$52 million. In August 2018, the 1962 Ferrari 250 GTO chassis number 3413GT sold at auction for US$48,405,000. Thirty-three cars were made