Use these player names for the desired effect

Code Result

yakuzadeath - God mode
blastboy - All weapons
beefcake - Brutality increases
meatman - Hampsters
iamasucker - All level, all weapons, invulnerable
muchcash - + 500.000$
forallgt - All weapons
bemeall - All towns
elvis is here - No police
coolboy - Money

In the Data folder, which is located in the game folder, there is a file NYC.GCI. Make a backup copy of this file before editing anything, then open it up with any text editor. In the file are stats and more for all the cars in the game.

For example:

{Cop Car} - [Car Name]
12 {model} - [Model no.]
1 {turbo} - [if car has turbo power 1:enable 0:disable]
60 {value} - [Destroy Value]
0 {pad} - [Unknown]
f14.500 {mass} - [Weight of car]
f1.000 {front drive bias} - [Unknown]
f0.500 {front mass bias} - [weight in the front part of the car]
f2.000 {brake friction} - [how good the brake is]
f0.433 {turn in} - [Unknown]
f0.400 {turn ratio} - [how good the car can turn]
f1.250 {rear end stability} - [how stable the back of the car is]
f0.400 {handbrake slide value} - [how much you will slide]
f0.150 {thrust} - [how much thrust goes into acceleration]
f0.415 {max_speed} - [the max speed the car can reach]
f1.000 {anti strength} - [the cars strength, set to f0.000 for car invincibility]
f0.115 {skid threshhold} - [how much the car skids]
f0.550 {gear1 multiplier} - [Unknown]
f0.680 {gear2 multiplier} - [Unknown]
f1.000 {gear3 multiplier} - [Unknown]
f0.180 {gear2 speed} - [how much speed extra is given in this gear]
f0.290 {gear3 speed} - [how much speed extra is given in this gear]

Tips:

When you enter muchcash you get 500000$,when you start the level.Then save the game and quit the level.Then load from saved status and now you have 500000$ more than before on our account.You can do the trick often you want.

Tune radio:

While driving a car that has a radio, press Up to change stations.

Hints:

Hint 1:

The cops can be your friend, especially when you're in rival gang territory and you need some additional firepower. Make sure there's a cop around when the gang attacks you. As long as you don't shoot back, the police will attack the rival gang, effectively providing you with cover.

Hint 2:

Weapon pickups regenerate. If you're not under a time limit, hang out until a weapon respawns, then pick it up for more ammo.

Hint 3:

Collect the little GTA2 logos to unlock bonus missions.

Hint 4:

Be on the lookout for ramps. To see where the ramps lead, get a good head start to build up some speed. They almost always send you somewhere that has a special bonus