Anilrgowda

Weaken cops:
Input KEYSTONE at cheat screen in options

Become invincible:
Input IRONMAN at cheat screen in options.

Infinite Ammunition:
Input ZOOMZOOM at cheat screen in options.

Zero Cost:
Input TOOLEDUP at cheat screen in options.

Indestructible Cars:
Input ROLLBAR at cheat screen in options.

All Vehicles:
Input CARSHOW at cheat screen in options.

All Weapons In Your Time Zone:
Input GUNRANGE at cheat screen in options.

Bodysnatcher Mode:
This Cheat is unlocked once you get 666 miles on your odometer. Once toggled on in the "Cheat" screen you can become any pedestrian by simply melee attacking them.

Bodysnatcher Mode - Reach 666 miles on Odometer

Collecting Stars:
Collect the scattered golden stars throughout the map to unlock the following rewards.

Note: Everything resets once you get to the 2006 era and collecting another 50 Stars will unlock the same attributes. (There are 100 total in the game)

Health Increase - Collect 10 Stars
Nitrous Increase - Collect 20 Stars
Double Ammunition Capacity - Collect 30 Stars
Double Car Durability - Collect 40 Stars
Free Vehicle Upgrades - Collect 50 Stars

Unlockables:
Ram Raider - Complete the Game
Atlus Racer - Complete the Game
Negotiator Vehicle - Complete the Game
Then & Now (Era) Change Option - Complete the Game

Unlockable Vehicles:
Atlus Racer - Beat the Game
Negotiator Vehicle - Beat the Game
Ram Raider - Beat the Game

Easy money:
On your third mission where Ray asks you to collect $1,500 and deliver the money to his Auto Shop in La Guardia, enter the La Guardia Circuit Race. Win first place under any difficulty setting. Upon completion of the race, the Circuit will close and you will not be able to race again. Save the game (provided that the autosave feature is turned off) and restart the mission. The La Guardia Circuit Race will then be re-opened, but you will retain the money you won from the last race. Repeat this to continue earning as much money as desired. Once you have the money you need, return to Ray's Auto Shop and to the green marker to make upgrades to your cars. This makes it easier to win the La Guardia Races. To complete the mission and continue the game, have at least $1,500 and go to the yellow marker at Ray's Auto Shop at the start of the mission.

Driver references:
Driver posters are visible on the walls of the 1978 safe house.
Graffiti reading "Tanner Lives" can be seen on the walls of the 2006 safe house.
Driver strategy guides are found on a magazine rack in police headquarters.

Stuntman reference:
Stuntman posters are visible on the walls of the 1978 safe house.

Programmer references:
Look on the newspapers blowing around the streets, taxi signs, the safe house dart board, and the safe house refrigerator door to see photos of the development team.

The Reflections logo can be seen as graffiti on some walls.

The Atari logo can be seen on a neon signs at Times Square.