In a tribute to Valentino Balboni, one of Lamborghini’s most noted test drivers, the Italian exotic-car automaker has introduced the Lamborghini Gallardo 550-2 Valentino Balboni edition. Unlike the standard AWD Gallardo models, this limited edition exotic is rear-wheel drive to save weight and improve performance. Among a list of performance tweaks is a 550 hp 5.2-liter V-10 that accelerates the Lamborghini to 60 mph in just 3.9 seconds.