Redline

To enable the cheats, hold down the G,0,D keys while 
in the game all at once. This should bring up a text 
area were you can input the cheats.

IMMORTAL   - God mode on
MORTAL     - God mode off
RETICLE    - Smart Reticle; turns red when over a target
CAMERA     - Third person view when on-foot
ALLAMMO    - All on-foot weapons have max ammo
TARGETS    - Targeting for on-foot weapons
DMDAMAGE   - Double damage when on-foot
RADAR      - On-foot radar
CW         - All car weapons
CA         - Max car ammo
STONEAGE   - Running person in place of car
CAROFF     - No car geometry
CARFLIP    - Flip car geometry
CARREVERSE - Reverse car geometry
WHEELSOFF  - Toggle car wheels 
TEAMBEYOND - Beyond Games Credit World 

GameTips
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Tip 1
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To escape quickly and get the most out of your ammo, 
drive backward and fire at pursuing enemies. 

Tip 2
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To make it easier on your fingers, create a custom 
control scheme for both on-foot and behind-the-wheel action. 

Tip 3
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Multiplayer tip: Drop mines near power-ups and 
blow up greedy opponents.