Circuit Breakers

Start a one-player game, then pause and goto options. Select 'sound' and highlight 'FX volume, then press L1+L2. the game will now be 400% complete.

Pause the game then select the sound option. Highlight the effect option then press both left shoulder buttons.

On the circut selection screen, hold: L1+L2+R1+R2 until a headlight appears in front of the car. Now start any circut to race at night.