Upon taking the reins at Lamborghini, Audi demanded the cessation of all existing prototype products, which makes the Pregunta the last bespoke coachwork ever built on an original Lamborghini base. Hand-built in Heuliez' Turin studio in Italy, the one-off Lamborghini Pregunta Speedster concept boasted a 530 horsepower V12, and was capable of hitting a 207 mph top speed. Inspired by the space and aircraft industry as well as Formula 1 racers, the Diablo's all-wheel-drive set-up was replaced with a lighter, more extreme rear-wheel drive structure with radiators moving to the front.