In January 2008, Lexus displayed a roadster version of the LF-A concept car designated LF-A Roadster, or LF-AR, at the North American International Auto Show. Initial specifications for the roadster were a V10 engine having a displacement of 5.0 L and rated at over . The car's top speed was reported to be over . Automotive photographers capturing the LF-A in various test guises had photographed a disguised convertible test model, dubbed LF-A Spyder, on the Nürburgring as early as October 2005. After its debut at the 2008 North American International Auto Show, the LF-A Roadster was also shown at the 2008 Pebble Beach Concours d'Elegance, the 2008 Geneva Motor Show, the United States Open Championship tournament, and at Lexus exhibits in Japan. A single LF-A racing prototype was also entered into Veranstaltergemeinschaft Langstreckenpokal Nürburgring endurance races at the Nürburgring in May 2008, competing in the SP8 class of VLN events. Media reports uncovered an LFA trademark filing with the United States Patent and Trademark Office in December 2008, with the concept LF-A name dropping its hyphen to become LFA for a possible production model.