5. Polaris Slingshot
We are moving from a classic to something totally different. Polaris is a company which specializes in snowmobiles and quads, but they also launched the three-wheeled motor vehicle named the Slingshot. One wheel is located at the back of the car and two at the front, while the interior is waterproof. GM was in charge of designing the engine, and they came up with a 2.4-liter Ecotec unit good for 173 horsepower and 166 lb-ft of torque.