Lamborghini Aventador J

The new Ferrari F12berlinetta is not the only exotic supercar making its world premiere at the 2012 Geneva Motor Show as Lamborghini has prepared its own special introduction that may very well steal the spotlight away from Maranello.

Lamborghini Aventador JMeet the Lamborghini Aventador J, a one-off speedster model based on the Aventador LP700-4 coupe, which the Italian company claims will find its future owner by the end of the show.

And when Lamborghini says a one-off, it means it as there is only one car, no prototypes and no other example for the Lamborghini Museum. However, for the less fortunate millionaires seeking an open top experience, they'll be happy to learn that the Italian automaker is also preparing a "regular" roadster version of the Aventador.

The special model displayed in Geneva is named after the FIA world motorsport organization's ‘Appendix J’ regulations that define the technical specification of racecars in certain classes.

Lamborghini's designers started by removing the roof along with the windshield and largely redesigning the carbon fiber monocoque, while also adding two safety bars behind the seats.

There's more carbon fiber to be found both on the restyled exterior as well as the interior including the special bucket seats.

On the outside, Lamborghini says that virtually every part was redesigned. The Italian exotic rides on new specially developed 20-inch rims at the front and 21-inch at the rear shod in extra beefy tires. It measures 4,890mm in length, 2,030mm wide and just 1,110mm tall.

The Aventador J loses many luxury amenities such as the air conditioning and the navigation systems not only to lower the supercar's weight down to 1,575kg (3,742 pounds), but also to provide a more extreme driving experience.

What remains the same as the Aventador LP700-4 coupe is the 691bhp (700PS) 6.5-litre V12 lurking behind the passenger compartment.

Lamborghini Aventador J

Lamborghini Aventador J

Lamborghini Aventador J

Lamborghini Aventador J

Lamborghini Aventador J

Lamborghini Aventador J

Lamborghini Aventador J

Lamborghini Aventador J

Lamborghini Aventador J

Lamborghini Aventador J

Lamborghini Aventador J

Lamborghini Aventador J

Lamborghini Aventador J

Lamborghini Aventador J

Lamborghini Aventador J

Lamborghini Aventador J

Lamborghini Aventador J

Lamborghini Aventador J