The following are known Action Replay Codes for Speed Devils on SEGA Dreamcast (Dreamcast). These codes were also known as GameShark Codes and in most cases will work on both devices.

Device Compatibility: Action Replay & GameShark

Lots of Points
CA8BE45D
0000FFFF

Infinite Turbos
58F76C58
00000014

Infinite Cash
72E5D0A7
0000CA00
AB3B5234
00003B9A