Tune Radio- While driving a car that has a radio, press Up to change stations.
Various Cheats- Use these player names for the desired effect:
NOTE: some codes reported as bad!
ITSALLUP- Get Level Select
LIVELONG- Get Unlim Energy
NAVARONE- Get All Weapons
HIGHFIVE- 5x Multiplier
BIGSCORE- 10 Million Points
NOFRILLS- Debug
LOSEFEDS- No Cops
IGNITION- Turbo car
DESIRES- Get Maximum Wanted Level
MUCHCASH- More Money
WUGGLES- Show Coordinates