Enter the following codes at the Password menu:
ethanol - Blurry Screen.
kerbkrawl - Exploding Curbs.
Europa - Moon Physics.
glycerine - Nitros.
T2 - Silver Cars.
vanishing - Unlock 705 Springs.
REARFEAR - Backwards Mode.
TWINPEAKS - Double Height.
GRUNTSOME - Extra Power.
MADCAB - Invicible Car.
WEFLIPPED - Mirror Mode.
Unlockable Cars:
AC Aceca:
Collect 400 total points in championship mode.
AC Superblower:
Collect 225 total points in championship mode.
Audi TT:
Collect 15 total points in championship mode.
Bently Hunaucieres:
Collect 545 total points in championship mode.
Celica GT4:
Collect 75 total points in championship mode.
Dodge Viper:
Collect 105 total points in championship mode.
Ford Mustang GT:
Collect 30 total points in championship mode.
Lotus 34CR:
Collect 140 total points in championship mode.
Mazda RX7:
Collect 335 total points in championship mode.
Mitsubishi GTO:
Collect 180 total points in championship mode.
Plymouth Prowler:
Collect 50 total points in championship mode.
Subaru Impreza WRX:
Collect 275 total points in championship mode.
TVR Cerbera Speed 12:
Collect 470 total points in championship mode.