At the personal options menu, enter the following name and racing team:

Name            Team    Effect
r petterson     Swe     All cars
Supercars       Grem    Overhead view
Demon           Grem    Bouncing cars
g-ride          West    L.A. style suspension
Buzz Aldrin     NASA    No gravity
Ignition        UDS     Ignition mode
Ramlosa         H2O     Water mode   - requires 3D accelerater card
Lemmy           Ace     Hell mode    - requires 3D accelerater card
Avenger         Zx      Avenger mode - requires 3D accelerater card