As for the magnum opus of breed, the Type 912 is arguably the most celebrated of its species. Designed to propel the Porsche 917 family of racing cars to victory, the 12-cylinder motor was produced in three main variations: 4.5, 4.9, and 5.0 liters. With this tower-of-power under the hood, the 917 was capable of hitting more than 240 miles per hour, which is a ridiculous top speed even by modern hypercar standards.