Activating this trainer:

Press F1 at main menu.

Listen for 'Trainer Activated'.

Press desired hotkey. All hotkeys can be changed on the trainer.

Trainer Options:

Numpad 1: Set CR Credits

Numpad 2: Set XP

Numpad 3: Unlimited Durability Meter

Numpad 4: Low AI Durability Meter

Numpad 5: Freeze AI

Numpad 6: Spin Out AI

Numpad 7: Fast Acceleration

Numpad 8: Instant Brakes

Numpad 9: Super Jump

Notes:

Numpad 1: Set CR Credits - while at the menu you where you can select GARAGE, select GARAGE, then select MARKET and then press this key to set your Credits to the value shown in the trainer.

Numpad 2: Set XP - while at the menu you where you can select GARAGE, select GARAGE, then select MARKET and then press this key to set your XP to the value shown in the trainer.  The value of XP will determine your level, which will allow you to purchase or upgrade certain things that depend on your level.

Numpad 3: Unlimited Durability Meter - toggle this on and during events the durability meter remains full.  If this meter ever drops to zero, you become wrecked.  This does not prevent you from being wrecked due to mechanical, engine, tires, etc., or prevent visual damage to the car.

Numpad 4: Low AI Durability Meter - press this and during events the durability meter of the AI goes to almost zero, making them very easy to wreck.

Numpad 5: Freeze AI - press this to lock the AI into position and they cannot move.  You can get around them or target them more easily.

Numpad 6: Spin Out AI - press this to send the AI drivers spinning out of control, possibly causing them to smash into things and cause great damage.

Numpad 7: Fast Acceleration - tap this to accelerate your car quickly. You can use this to ram other vehicles or speed into or away from them.

Numpad 8: Instant Brakes - tap this to instantly stop in place.

Numpad 9: Super Jump - tap this to vault your car into the air.