This cheat can be done on arcade, original , or crazy box mode. At the select a character screen, press L+R, L+R, and then L+R again. Begin play and your driver will be on a bike instead of taxi cab.
Disable arrow indicators
Before the character selection screen appears, hold R + Start. If you entered the code correctly, the message "No Arrows" will appear in the lower left corner.
Disable destination indicator
Before the character selection screen appears, hold L + Start. If you entered the code correctly, the message "No Destination Mark" will appear in the lower left corner.
Before the character selection screen appears, hold L + R + Start. If you entered the code correctly, the word "Expert" will appear in the lower left corner. No stop or arrow indicators will appear in this mode.
At the character selection screen, quickly press L, R, L, R, L, R or L + R, L + R, L + R. Then, select a character to drive a bike instead of a taxi. Alternatively, complete all sixteen Crazy Box levels to unlock the Special Taxi for each character, which is selectable in crazy box, arcade, or original modes. To select the bike in crazy box mode, scroll to the right of Gus at the character selection screen. To select the bike in arcade or original mode, press Up at the character selection screen.
Another Day mode
At the character selection screen, press R, then hold R while choosing a driver. If you entered the code correctly, the message "Another Day" will appear. This mode modifies various positions in the game.
Press Accelerate + Drive.
Press Brake + Reverse.
Press Left or Right while shifting as quickly as possible into Reverse, then back into Drive at a high speed.
Crazy Drift Stop
Execute a Crazy Drift, then immediately execute a Crazy Stop
First, press [R] + [A] to boost, then tap [B] to highlight [R]. Press [R] + [A] again. This is useful for Crazy Jumps and Bowling.
Select arcade mode and ten minutes for the time limit. Pick up a customer, then go under the water and remain there for two minutes. You will get ten extra minutes.
Complete the nine original mini-games to unlock six new mini-games. Complete those as well. There will be one final mini-game. Once you complete that, you can select a bike for any of the characters by pressing [Up] or [Down] at the character selection screen.
Execute a Crazy Drift, wait until you have spun 180 degrees, then press "Reverse" + "Drive". You can earn as much as a 450 combo and $99,999.