Get Faster Mercedes: Put in Reki for the driver's name
Get New Helmets: The more hours you play, the more helmets you unlock. Every hour you play Project Gotham, you get another.
Get New Paint: To earn some nifty new paint jobs, rack up five hours of gameplay. That's it. Just play.
Unlock Everything: To unlock it all in one go, enter "Nosliw" as your character name. All tracks and cars will now be at your disposal. Unlock Lotus Exige: To unlock the Lotus Exige, get 50,000 total Kudos.
Unlock Panoz Esperate: To unlock the Panoz Esperate, get 25,000 Kudos.
Unlock the VW Beetle: To get the Beetle, simply get 1000 Kudos on easy difficulty.
To get everything in the game: all the cars, paintjobs, etc. when you type in your name, name yourself Nosliw - case - sensitive - Wilson backwards. Now you will have everything including the Ferrari F50 - my favourite car!