Call it headless horsepower. The flagship Lamborghini Murci lago — the 640-hp LP640 — is now sans top. The company is introducing its LP640 Roadster at the LA show this week, and we'd imagine it'll suck the oxygen out of the room with its air of menace and tricky convertible-top. Like its coupe sibling, the roadster is powered by Lamborghini's 6.5-liter "longitudinale posteriore" V12, which produces 486 lb-ft or torque and revs to 8,000 rpm. Zero to sixty in 3.4 seconds, and a top speed of over 200 mph puts the LP640 on par with the Ferrari Enzo, though the roadster is slower by a split second. To allow for open-top rocketry, the roadster gets an altered frame architecture, with carbon-fiber engine compartment reinforcements, though the canvas top is only rated to 100 mph. No word on price, but expect to reach right up to the mid six-figures when the roadster hits the market in 2007.