These cheats are self explaining.

Insert the cheats during normal gameplay.

GUNSGUNSGUNS - Get All weapons
IFIWEREARICHMAN - More $$
GESUNDHEIT - Max health
MOREPOLICEPLEASE - Max wanted level
NOPOLICEPLEASE - Less wanted level
GIVEUSATANK - Get tank
BANGBANGBANG - Destroy cars
ILIKEDRESSINGUP - New outfit
ITSALLGOINGMAAAD - Crazy People
NOBODYLIKESME - People Hate you
WEAPONSFORALL - People fight everyone
TIMEFLIESWHENYOU - Time moves faster
BOOOOORING - Gameplay moves faster
TURTOISE - Max armor
SKINCANCERFORME - Weather clears
ILIKESCOTLAND - Weather is cloudy
ILOVESCOTLAND - Weather is rainy
PEASOUP - Weather is foggy
MADWEATHER - Time sped up
ANICESETOFWHEELS - transparent car mode
CHITTYCHITTYBB - Low Car Gravity
CORNERSLIKEMAD - Instant turns
NASTYLIMBSCHEAT - gore mode