Access All Cars and Tracks

At the menu with Start, Timetrial, Settings, Option, and Records, quickly press the following on Controller 2: Simultaneously press R1, R2, and L2, R2, L2, simultaneously press R1 and Tri. If you entered the code correctly, you'll hear a booming sound. When you start a game, you can select all the hidden cars and race on hidden tracks.

Hidden Cars

To get the hidden vehicle, satisfy the conditions below:

PCS: Clear the First Stage within four minutes.
GTI: Clear the Second Stage within four minutes.
DBL: Clear the Third Stage within four minutes.
VPR: Destroy more than $1 million in the First Stage within 300 seconds of the start.
ELS: Destroy more than $2.5 million in the Second Stage within 270 seconds of the start.
360: Destroy more than $2.5 million in the Third Stage within the time limit after hitting a telephone booth.
GTK: Drive at over 180 km/hour at the second speed checker and still clear the mission.
F1: Clear the First Mission without damaging any objects.
PLC: Clear the Second Stage without any destruction.
TNK: Clear the Third Stage without any destruction.