While racing, press Up on the Control Pad to honk your vehicle's horn.
You get the first medal by finishing all areas.
You get the second medal by collecting all body's.
You get the third medal by collecting all engines.
You get the fourth and final medal by collecting all the parts.
Ever wondered where the demo in this racing game went? Well here it is: When the game reaches the title screen and then it says ''Press start'', press B instead of start to see the demos, I think there are a total of 5 in all.