Looking for the one in the main series? see Koopa Clown Car.
The Koopa Clown is one of the kart body parts in Mario Kart 7. It is based on the Koopa Clown Car which is seen all throughout the Super Mario series. It has good handling, but lacks good acceleration and off-road features.
The Koopa Clown reappears in Mario Kart 8 Deluxe as an unlockable kart body part. Unlike in Mario Kart 7, the vehicle itself now has shorter exhaust pipe in the rear. A side panel on both sides pop open to reveal small propellers when the Koopa Clown is in anti-gravity and gliding sections. A larger propeller also comes out from the bottom when the vehicle is in said sections. In terms of stats, the Koopa Clown has a huge reduction in acceleration and a slight reduction in speed.