The Lamborghini Sesto Elemento is a high-performance track-only limited edition sports car produced by Lamborghini. Styled by Filippo Perini and unveiled at the 2010 Paris Auto Show, the Sesto Elemento is powered by a 5.2L CEH V10 from the Lamborghini Gallardo Superleggera mated to a 6-speed "e-gear" automated manual; the engine makes 562 horsepower. The car's name, literally translating to "sixth element", references its extensive use of carbon fiber; it is the first car to use a forged carbon fiber tub and suspension arms, using a new composite developed jointly by Lamborghini and Callaway with assistance from Boeing. 20 cars were produced, each for $2.92 million, this being the most expensive Lamborghini until the introduction of the Veneno in 2013; it is rumored however that only 10 were actually produced due to lack of customer interest.