Ferrari 166 MM
Ferrari used its 2 L (1995 cc/121 in3) V12 engine in a number of models, all called 166 for the displacement of a single cylinder. Most early 166's were sports cars built for racing, though a later line of GT cars launched the company's street model line.
Motor Trend Classic named the 166 MM Barchetta as number six in their list of the ten "Greatest Ferraris of all time".
Source: Wikipedia, 2011