Activating this trainer:
Press F1 at main menu.
Listen for 'Trainer Activated'.
Press desired hotkey. All hotkeys can be changed on the trainer.
NumPad1: Infinite Health
NumPad2: Infinite Nitro
NumPad3: Change Money By 10000
NumPad4: One Hit Kills
NumPad5: Kill All Enemies
NumPad6: Infinite Ghost Time
NumPad7: Change Points By 10000
Change Money: In career if your money is shown press hotkey to add more.
Kill All Enemies: Press hotkey and all enemy cars are destroyed. Press again to deactivate.
Infinite Ghost Time: The ghost mode after resetting your car remains as long as this option is active.
Change Points: In flatout mode press hotkey to add points to your current round.
Unlock more trainer options including updates from here - FlatOut 4: Total Insanity Trainer