The Lamborghini Aventador J got its name, rather bizarrely, from the sporting rules of the FIA world motorsport organization. Its “Appendix J” defines the technical specification of race cars in the various classes. It gets the 6.5 liter V12 with 700hp power rating and the same 1,575kg dry weight as the Lamborghini Aventador.
Obviously, the design features a speedster roof. It uses a new type of carbon fiber fabric called “carbon skin” made of woven carbon fibers soaked with a very special epoxy resin that stabilise the fiber structure and keeps the material soft.