When the word "Turbo" appears during the demo, on controller 2 press Down, R, Up, L, Y and B
before the title screen comes into full view. You'll now be able to dial up the speed to 10 stars,
rather than the usual 4 stars.
Special Move Configuration Screen
Enter the Vs. mode. When you reach the stage select screen, press Down, R, Up, L, Y, and B on controller 2. You'll here a tone, and a new sub screen will appear.