Two hidden cars to be unlocked via code
On the car select screen, there are two hidden cars to be unlocked via the gearstick : Code Effect
Highlight the Toyota Chaser and enter Neutral, 6, 4, 3
The Chaser changed into the Celsior
Highlight the Nissan S30 and enter Neutral, 6, 4, 3
The S30 changes into the Z31
Have fun with these 2 cars.