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:

NumPad1: Add Cash By 500

NumPad2: Add SP By 5

NumPad3: Add XP By 50

NumPad4: Unlock All Items

NumPad5: Unlock All Tricks

NumPad6: Unlock All Levels

NumPad7: Level Up

NumPad8: Infinite Nitro

Notes:

Cash / SP / XP: In menu where your cash is visible press hotkey to add more.

Unlock All Items: Press hotkey and all items are unlocked.

Unlock All Tricks: Press hotkey and all tricks are unlocked.

Unlock All Levels: Press hotkey and all levels are unlocked. You may have to complete a race etc. before the levels get updated.

Level Up: Press hotkey to instantly level up and get more gear packs.

Infinite Nitro: While active you have infinite nitro during race.