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Lamborghini hardly needs any ego boost or reputation improvements. But the prestigious Italian automaker has outdone itself with what is being touted as the most expensive car ever built.

Lamborghini recently introduced the Reventon at Frankfurt's international auto show. It's the only one of a pending production of 20 vehicles that have been described as "an arrow with four wheels."

The price for the Reventon? Try one million Euros, or about $1.4 million.

But just in case you're in the market for the vehicle, you're out of luck. Lamborghini has already sold all of the cars — before they're built.

"As soon as the word got out, we sold out in four days," Chief Executive Stephan Winkelmann told Reuters. "We have among our customers movie stars, sports stars, but the majority of our clients are businessmen. Men. Lovers of luxury goods.

Lamborghini named the car after a bull that killed matador Felix Guzman in 1943.

Although based on its Murcielago LP640 model, Lamborghini's engineers took inspiration from a fighter jet and reworked the composite carbon fiber body to accentuate the sleekness and angular edges usually associated with its cars.

The engine is the same as the LP640: a 12-cylinder configuration that can accelerate from zero to 60 mph in 3.4 seconds.

Lamborghini will start making the Reventon in January, 2008 and deliver them in  October.