The Lamborghini Diablo Roadster prototype was presented in 1992 at the Geneva Motor Show. In principle, there was not much change in the original form of the Diablo. The roof was removed and the frame of the Diablo slightly modified to effect more stiffening. The windscreen has been pulled extremely low, giving it an all-round line at the height of the air intake openings behind the entrances. Nevertheless, the driver still sits below the top-mounted rear-view mirror, which is painted in the body color due to the low seating position.
Inside, some changes have been made. The dashboard is narrower, but still carries all the necessary clocks and switches. The two seats are separated by a disguised tunnel. This has only the function to allow the view of the rear-view mirror between the seats backwards.
Above the rear wheel arches, each have large air intakes to add sufficient air to the engine for cooling. The two air inlets on the side are also slightly larger than the Diablo Coupe. The rims are painted in the body color.
Actually, a small series of the Diablo Roadster prototype should go into production. Unfortunately, it never happened. But since the customers of the Lamborghini Diablo certainly asked for a roadster, Walter Koenigg began in Munich to rebuild some coupes in Diablo Roadster. These roadsters were similar to the prototype. But they got with Walter Koenigg a slightly modified front and a spoiler at the rear. The engine was also modified with turbochargers and brought it to 750 hp.ts on the side are also slightly larger than the Diablo Coupe. The rims are painted in the body color.
In 1995, however, Lmboghini prohibited Walter Koenigg from further manufacturing such special models, because the Diablo Roadster should now be delivered directly from the factory in Sant’Agata.