Cars that are ranked legendary are the rarest cars in the game, and are the hardest to get from the Slot machine. As a result, they often have a special ability or have good stats. See Cars for more info on stats of legendary cars. There are 9 legendary cars total in the game currently, and below are listed pages describing said legendaries.
2: Time machine
3. Oil Truck
4. F1
6. Boom Bus
7. Moneyman
8. The Beast
9. Flipper