Select one player mode and enter the car selection screen. Enter "Garage A", hold Circle and press X. Car A03 (the Convertible) will now have its top down. Enter "Garage B", hold Circle and press X. Car B04 will have new headlights and new colors. Enter "Garage C", hold Circle and press X. Car C06 will have a sun roof.

To get special class vehicles enter the car selection menu. Highlight "Garage A" and press L1 + Circle. Highlight "Garage B" and press L1 + Circle. Highlight "Garage C" and press L1 + R1 + Circle.