Unlimited Turbos- At the main menu press C-Right, Z, C-Up, C-Down, R, C-Left, Z, C-Right.
Nightime Racing- At the main menu press C-Up, C-Up, C-Down, C-Down, C-Left, C-Right, C-Left, C-Right.
Stealth Mode- At the main menu press C-Left, Z, Z, C-Up, C-Left, R, C-Down, C-Up.
Wire Frame Display- At the main menu press C-Up, Z, C-Down, C-Left, C-Up, Z, C-Down, C-Left.
Mirrored Tracks- At the main menu press Z, R, Z, Z, R, Z, Z.
Get TowJam Car- At the main menu press C-Up, C-Down, Z, R, C-Left, C-Right, C-Up, C-Down.
All Cars- To get all cars, enter the following codes: _WYVWZLVDWVTXWWVWWWF (this may only work for one player, don't forget the space before the code!).