LE-2001 truck:
Press Y, X, Right, Left, Right, Left, Down, Down, Up, Up at the mode selection screen. Alternately, successfully complete expert mode in first place using the Coyote.

T4 fighter jet:
Press Left, Right, Down, X(4) at the mode selection screen. Alternately, achieve 100% on the level checker when building your car.

Additional colors:
Press Down, Left, Up, Right, X, Y, L, R at the mode selection screen to unlock a fourth color set. Alternately, successfully complete expert mode.

Random weather in time attack mode:
Press R, X(7), Y(7) at the mode selection screen.

Super expert mode:
Press Left, Left, Right, Right, Left, Right, X, Y(8) at the mode selection screen. Alternately, successfully complete expert mode under the championship difficulty using the Beelzebub Buggy.

Beelzebub Buggy:
Successfully complete expert mode in first place.

Quick start:
Accelerate as soon as "Go" is announced during the pre-race countdown.

Super reverse cyclone:
Unlock the fighter jet, then go into the practice area. Go off course, then go in reverse. If done correctly, the game should start going in one direction by itself. Press Analog-stick Down/Right and eventually you will begin doing a super reverse cyclone.