https://www.cnet.com/roadshow/news/lamborghini-aventador-svj-roadster-geneva-motor-show/

To keep weight to a minimum, the SVJ Roadster's convertible roof is a carbon-fiber affair that stows in the frunk and can be released by way of quick-release levers inside the cabin. All told, the Roadster weighs just 110 pounds more than the SVJ Coupe.

New bodywork not only gives the SVJ Roadster a racier look but also helps with performance. Larger air intakes and side fins help contribute to 40 percent more downforce than the prior Aventador SV Roadster. There is, of course, a massive rear wing and large twin exposed exhausts protruding from the rear fascia.