Well, the codes for the full version of that brilliant race
 simulation. All bonus and malus tons can be received:

 BIGBOTTOM        - Bodywork Trashed
 SUPERHOOPS       - Explosive Peds
 IGLOOFUN         - Hot Rod
 GOGGLEPLEX       - Underwater Ability
 SPAMFORREST      - Instant Handbrake
 INTHELOFT        - Drugs
 BUYOURNEXTGAME   - Jelly Suspension
 CHICKENFODDER    - Bouncey
 FUNNYJAM         - Turbo Peds
 TRAMSARESUPER    - Pedestrian Harvest
 ISLANDRULES      - Vesuvian Corpses
 SMALLUDDERS      - Giant Peds
 SPAMFRITTERS     - Free Repairs
 GIVEMELARD       - Mega Bonus (Loads Of Money)
 SPAMSPAMSPAMSPAM - Pedestrians Glues To Ground
 IHAVESOMESPAM    - Gravity Has Gone Strange
 MOOSEONTHELOOSE  - Pinball Mode
 ILOVENOBBY       - Pedestrains Shown On Map
 RUSSFORMARIO     - Pedestrian Electro Bastard Ray
 HAMSTERSEX       - Blind Pedestrians
 NAUGHTYTORTY     - Pedestrian Respawn
 BOYSFROMTHEBUSH  - Grip O Matic Tires
 RABBITDREAMER    - Jupiter Gravity

 "Sorry, bet that hurts"

 Unbeliveable, a network game cheat:

 At the Network Race-type selection screen, type in JOYRIDER. You'll
 get access to all cars for network play. You'll need to select 'all'
 cars in the options screen to use them.

 NOTE: This works with manual or random car selection.