Enter one of the following codes at any menu before starting a race:
Race with more traffic on the road: rushhour
Police yell comments during chase: bullhorn
Fast car in single race mode: gofast
All cars are fast in single race mode: madland
Empire City track: empire
El Niño bonus car: elninor
CLK GTR bonus car: merc
Jaguar XJR-15 bonus car: jag
El Niño pursuit car: ecop
Diablo pursuit car: dcop
Enable all cars: allcars