The following are known Action Replay Codes for Midnight Club: Street Racing on Nintendo Game Boy Advance (GBA).
These codes were also known as GameShark Codes and in most cases will work on both devices.

These codes are for the U.S. version of the game.

Master Code – Must Be On
4a18472c
695bec93
3fdd4c9f
64211726

Take No Damage
6f1a04de
335f6228

Low Time
95eb13b2
7f896392

Never Any Traffic
73b1a18c
74b255c3