Aero Gauge

China Town Jam track:
Complete Grand Prix mode in first place on each track under the "Expert" difficulty level.

Neo Speed Way track:
Complete Grand Prix mode in first place on each track under the "Intermediate" difficulty level.

Nintendo 64 controller vehicle:
Begin game play in time attack mode. Keep racing until obtaining a time that ends in .064 seconds. Press R when selecting this vehicle to change colors from red, green, blue, black, or yellow.

Dominator vehicle:
Complete the game in first place with the Black Lightning under the "Expert" difficulty level.

Prowler vehicle:
Complete the game in first place with the Hornet under the "Expert" difficulty level.

Reaper vehicle:
Complete the game in first place with the Shredder under the "Expert" difficulty level.

Vengeance vehicle:
Complete the game in first place with the Avenger under the "Expert" difficulty level.

Higher speed:
Unlock all the secret tracks and vehicles, then complete the game in first place in expert mode with the Reaper. You will now be able to go 500 mph with the Avenger.
Information in this section was contributed by Raymond Nations.

All tracks and vehicles:
Hold L + R + Z on controller two before the title screen appears. Keep those buttons held, then quickly press and release Up + C-Down on controller two when "Push Start" flashes on the title screen. Then, press Start on controller one before the title screen disappears. Note: The timing of this code is particularly sensitive; all buttons must be pressed and released at exactly the same time as indicated.

Alternate vehicle color:
Highlight a vehicle on the selection screen, then press R.

Quick start:
Hold A + B before the race begins. Release B immediately after the commentator says "Ready".

Turbo:
Begin game play and hold A to speed up. Hold Z and press Analog-stick Left or Analog-stick Right, release A and Z, then quickly press A + Z. A sound will confirm correct code entry.

Faster Grand Prix credits:
Press Start when the credits appear after a Grand Prix.

Hint: Speed and altitude:
To fly faster climb until blue flames appear. If you stay low, the flames will be red and your speed will be slower.
Information in this section was contributed by honkerdeli.