You can enter one of these cheat codes in any menu
Merc
Mercedes CLK GTR
Elninor
El Nino
Jag
Jaguar XJR-15
Superchargecop
El Nino (pursuit version)
Empire
Empire City track
Cars
All cars
Gofast
Makes Your cars faster
Monkey
Angry traffic drivers
Rushhour
A lot of traffic cars
Go##
Traffic cars (Where "##" is a number between 01 and 21)
Madland
Alot of cops
Bullhorn
Try it in "Hot Pursuit" mode !!!