Describing it as "the most uncompromising open super sports car in its entire history, Lamborghini took the wraps off of the stunning Aventador J in Geneva. Although based on the Lamborghini Aventador LP700-4 Coupe, this literal one-off exercise takes the stun factor to a whole new level.

"With the Lamborghini Aventador J, we have molded our brand DNA into its most definitive form to-date. This automobile is as extreme and as uncompromising as only a Lamborghini can be," noted Stephan Winkelmann, President and CEO of Automobili Lamborghini. "Nowadays we are confronted with several regulations that we face in the spirit of challenge. The Aventador J is the proof that, despite the rules, Lamborghini will always make people dream, even in the future."

The Lamborghini Aventador J draws its name from the FIA's sporting code, specifically "Appendix J" that covers technical specifications for race cars in various classes. This raging roadster also pays historic homage to the 1970 Lamborghini Jota, which was a super-hot concept variation of the automaker's Miura production model. While carbon-fiber reinforced polymer remains at its superlight core, the Aventador J's structure has been thoroughly reworked to help it cope with the rigors of going topless. That includes the addition a pair of fixed roll hoops behind the seats and a new X-shaped bracing element that frames the mid-ship engine compartment.

In addition to dispensing with the LP700-4's fixed roof and replacing the front glass with a pair of laid-back wind deflectors, the full-composite bodywork on the Aventador J boasts even more dramatic cues. The front clip is dominated by a huge air intake with functional winglets and features a narrower cross section than its coupe cousin accented by a periscope-style rearview mirror. At the rear, an equally massive diffuser balances the front scoop while four huge exhaust outlets, Lambo-signature five-element taillights and a fixed rear spoiler complete the all-function, all-the-time look. Body bits not rendered in bare carbon fiber are painted in a special high-intensity red finish that features a semi-chrome look. Like the LP700-4, the Aventador J also has doors that open upwards, prominent side air intakes and wraps its huge low-profile performance tires around bespoke central-lock wheels that match aluminum with carbon-fiber inserts that act as mini cooling fans for the brakes.

Inside, the Avantador J's cabin is an equally minimalist environment, devoid of creature comforts like climate control, audio and navigation systems and loaded with even more carbon fiber elements that help trim its dry weight to 3,472 pounds, about 300 less than the LP700-4. The driver is kept appraised of all vital stats via a pair of programmable TFT displays behind the car's racing-style steering wheel with the rest of the instrumentation confined to a starter button and switches for the lights and transmission. A leader in carbon fiber innovations, Lamborghini has introduced a clever variation on the theme for the Aventador J. Its Forged Composite racing buckets are trimmed with a new material called Carbonskin. Patented by the automaker, this high-tech fabric is made from woven carbon fibers soaked in a special epoxy resin that stabilizes the fiber structure while keeping the material soft. In addition to adding a matte carbon black shimmer to the seat inserts, it's also used to cover the rest of the Aventador J's cabin - and likely will be found in future Lambo supercars.

Despite its blatant racing overtones, the Lamborghini Aventador J was designed to be fully street legal. Its powertrain consists of the same 691-horse/6.5-liter V12 engine and 7-speed automated manual transmission used in the LP700-4 - a pairing that reported will give this al fresco flyer a top speed in excess of 186 mph. A J-spec version of the LP700-4's full-time all-wheel drive system and competition-derived pushrod suspension also are on hand to ensure that motive might be fully exploited in this significantly-lighter package.

Although Lamborghini promises that the overall Aventador saga has just begun, it's equally adamant this will be the sole example of the Aventador J ever produced. After its appearance in Geneva, the car will be sold to some extremely well-heeled individual. Rumor has it that a deal has already been struck, and that the price tag to own this brilliant bit of Lambo history was somewhat north of $2.9 million.

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