2011 Lamborghini Aventador2011 Lamborghini AventadorLamborghini�s flagship gets an extensive overhaul that includes a 691-hp V12, a proprietary seven-speed, single-clutch sequential gearbox and a carbon-fiber monocoque that weighs only 325 pounds. Virtually every aspect of the outgoing Murcilago has been reimagined�from the new inboard, pushrod-actuated suspension system to the network of