Repair Power 
Press L button, Z button, R button, L button, and
START. Do it at the race description screen 

Speed Warp View 
Z button, C-Left, R button, Up(on control pad), 
Right(on control pad) 

Speed-based aspect ratio 
Z button, C-Left, L button, Up(on control pad), 
Right(on control pad) 

Topsy Turvy 
Press C-Up, Z button, START, Up(on the control pad),
Down(on the control pad). 

Wobble Tire 
R button, C-right, START, Down(on control pad), Z 
button 

by Mark