While inside the pause menu, go to cheats and input the code "steelman".
Stuntman:
Stuntman posters can be seen on the walls of the 1978 safe house.
Stars:
Get the scattered golden stars throughout the map to reap the following rewards.
Unlockable - How to Unlock: Free Car Upgrades - Get 50 Stars Double Car fortified - Get 40 Stars More Ammunition - Get 30 Stars More Nitrous - Get 20 Stars More Health - Get 10 Stars
