4. Volkswagen GX3
The Volkswagen GX3 was a three-wheeled, high-performance roadster unveiled in 2006. It featured a 1.6-liter four-cylinder engine producing 125 horsepower, enabling acceleration from 0 to 60 mph in just 5.7 seconds. Designed for the U.S. market, the GX3 aimed to offer an affordable alternative to traditional sports cars, with a projected price under $17,000. However, safety and liability concerns led Volkswagen to halt its production, leaving enthusiasts to imagine a world of street-legal trikes. (motortrend.com)