Special class vehicles
Go to 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. Then, re-enter the car selection menu and choose the new "Special" option. Now the bus, truck, McLaren F-1, and scooter will be selectable.
Alternate car appearance
Choose 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.
Note: Each of the hidden vehicles may be saved for easier selection after they are found the first time. All vehicles may also be tuned up.
Nissan 240 ZX and Bus
Drive a car and beat the Bay Area track with a time less than three minutes.
Select a car and finish the Uptown Driveway track in first place on all three difficulty levels in one player mode. Then, finish in first place on the next level. Now race the Uptown Driveway track in time trial mode and find the parked Diablo.
Select a car and finish the Seven Tight Corners track in first place on all three difficulty levels in one player mode. Then, race the same track in time trial mode and find Porsche at the hotel.
McLaren and Truck
Select a car and Finish the Pikes Peak Hill Climb track with a time less than two minutes and thirty seconds. Note: These vehicles may only be driven in time trial mode.
Select a car and race the Northern Country track in time trial mode in a counter clockwise direction. Then, go through the gate that is near the river on the second lap to find the scooter.
While using the course editor to turn the cone white, hold X and press Triangle. Then, repeat this step until all the cones have been placed. Select a car and start the race. Now soccer balls will appear where the white cones were placed.
While in any garage, hold L1 and press R1.