Extra Tracks and Vehicles:
You need 2 controllers for this code...
Turn on the game and press Start on controller 1 until you see the screen that says "Push Start" (if you see "Grand Prix Mode", you're too far). On controller 2, press Up on the D-pad, C-Down, L, R, and Z all at the same time. Then release them. Immediately press Start or A on controller 1 to enter the Grand Prix mode. All tracks and cars should be available now.
When choosing car, press R. Each car has 2 colors, except the controller, which has 4 colors.
At the starting line, hold both the brake and the accelerator. When the starter says, "Go!", release the brake and your aerocar will rocket off the starting line.
Obtain Aeropad (flying controller):
Finish a race with the final 2 digits of your time being 64. This is really a matter of luck. Use this technique to get the other four hidden cars. NOTE: You must do it once for each car- you can't do it once and earn all the hidden cars.
Get The China Town Jam Track:
In Grand Prix mode with the Expert difficulty get first place on each course, and you will have the China Town Jam Track.
Get The Neo Speed Way Track:
In Grand Prix mode with the Intermediate difficulty get first place on each course, and you will have the Neo Speed Way Track.
Drive With The N64 Controller Cheat:
In Time Attack mode get a race time that ends in .064 seconds.
Get The Dominator:
Beat the game in first place in the Expert difficulty using the Black Lighting.
Get The Prowler:
Beat the game in first place in the Expert difficulty using the Hornet.
Get The Reaper:
Beat the game in first place in the Expert difficulty using the Shredder.
Get The Vengeance:
Beat the game in first place in the Expert difficulty using the Avenger.
Thanks to Revolution readers Steven Hayes, $Jeremy Rooth$, Benatoba, Mike and Kurtis Grove!