6 unique rides by independent engineers

• These 6 vehicles can't be found on the showroom floor
• They range from an amphibious Volvo to a 70 mile per hour toy Barbie Car
• Each vehicle has been modified or built from scratch by car enthusiast from around the world

The following is a transcript of the video.

Narrator: This Barbie car is no toy. YouTubers Edwin and Ethan build unnecessary motorized creations. Convinced most people thought about hot-rodding their toy car as a kid, the duo decided they would make it happen in real life. After buying a go-kart from Craigslist, they cut the frame to fit the length of the Barbie car and mounted the car on top. They removed the rear-mounted go-kart engine and replaced it with a front-mounted dirt-bike engine. Mounting the engine to the front removes weight from the rear and allows the Barbie car to effortlessly drift on command. After spending $1,700 on the project, the 70-mile-per-hour "toy" is both thrilling and dangerous.

Meet the Teslonda, a Honda Accord with a Tesla motor. After experiencing the performance of electric cars, Jim Belosic decided to build his own. Since the 1981 Accord is too small to fit a Tesla battery pack, it's powered by Chevy Volt batteries. But that doesn't affect the performance of the Teslonda. It can reach 60 miles per hour in just 2.45 seconds. That's faster than a Bugatti Veyron. These massive rear tires had to be added so the car can properly grip the road. Inside, you'll find a hodgepodge of buttons and switches to turn on the various systems and fail-safes and an infotainment system inspired by '90s-style arcade games.

This is a monowheel. It reverses the design of a typical car or motorcycle. Instead of sitting above the wheel, the driver sits inside. The tire is attached to the outer frame, while the motor and seat are attached to the inner frame. Inside the frame, a third wheel known as the roller gets powered by the motor. That wheel rotates the outer frame independent from the inside frame to propel the vehicle forward. Riding a monowheel isn't like riding a motorcycle. The handlebars can't be used to steer left and right. The system is navigated by leaning in the direction you want to go. Just make sure you don't overshoot it.

Theon Parseghian always dreamed of owning a car that could cross the lake, but the few amphibious cars that existed were out of his price range. So he built his own. The shape of his Volvo station wagon resembled a V-shaped hull, a common shape for boats. But it needed to be made waterproof before setting out on its maiden voyage. The doors and rear hatch were sealed to form a unibody design. The roof and windows were removed so passengers can still access the car, and the rear seats were replaced with a jet pump to propel the car forward in water. Once it's in the water, it can reach up to 10 miles per hour, and the front wheels act like rudders to steer the amphibious vehicle in the desired direction.

This is the Diwheel, one of many ambitious designs from Youtuber Master Milo. It's essentially a monowheel powered by a car. In this case, the car is the inner frame, and the wheels act as the rollers. Milo used an old, beat-up Ford as his donor car. He chopped the car in half and shortened it to fit inside rings wrapped in tire tread. Careful and strategic planning went into the design to ensure its safety.

These innovative vehicles weren't made by one engineer, but several. They're speedsters made from warplane fuel tanks. It's a form of hot-rodding that began post World War II, when junkyards were filled with old warplane parts. Known as belly tankers or lakesters, enthusiasts would chop up the tanks and drop in huge motors. Fuel tanks were designed with great aerodynamics, which made belly tankers ideal for speed. The speedsters were used to race across dry lake beds in attempts to set land-speed records. The fastest belly tanker ever built reached a top speed of 198 miles per hour.