It's not that unusual for a classic car to get a modern update, but normally the car's prior version actually made it into production. The Syrena Sport ($TBA), on the other hand, is based off a 1950s prototype that never got the chance to grace a showroom floor. This modern take is based on the Nissan 370Z, and is powered by a 3.7L V6 — instead of the twin-cylinder boxer of the original — that's good for 330 hp naturally aspirated or 450 hp in a turbocharged version. Other features include updated styling and a curb weight under 2,900 lbs. The bad news? Only one example is currently scheduled to be built.