There are limited editions and then there are really limited editions. The Lamborghini Aventador J is most definitely in the latter category. It’s a one-off, open-top version of the latest and greatest supercar from the Raging Bull. No windshield, windows, doors, air conditioning or navigation. Just 700 horsepower and 510 lb-ft of torque from the 6.5-liter, mid-mounted V12 funneled through a permanent all-wheel-drive system. And a dry weight of only 3,465 pounds to slow it down. The two occupants each have a wind deflector in front of them, which is probably not as useful as a crash helmet. And they will not only be sitting in plenty of carbon fiber, they’ll also be sitting on it; Lamborghini has patented a new fabric called “Carbonskin.” Incidentally, the “J” part of the name comes from Appendix J of the FIA regulations that goes into race car specs. But there’s also a reminder of the semi-legendary Jota: a one-off, open-top version of the 1960’s Miura. The Aventador J has already sold for about $2.8 million.