Various Secrets

Passwords
To go in Arcade mode without enemies enter
GO_SIGHTSEEING

For expert mode enter HARDEST_OF_ALL
To see all movies enter:

SEE_ALL_MOVIES
For big time air and hardly any gravity enter:
REDUCE_GRAVITY

For Invincibility enter:
I_WILL_NOT_DIE

To have mirror matches in 2-player mode enter:
SAME_CHARACTER

Select the "Game Status" option. Choose any character, then enter WMNNWLHTSCUCLH as a password to receive every vehicle and level.
Enter Password: Monster wheels with a space between for large tires.
Enter Password: DEADLY MISSILE again with a space. This makes all your homing missiles do more damage.

Secret Moves
Interceptor Missiles
    secret move #1: Halo Decoy
        up, up, down, machine gun(MG)
    secret move #2: Afterburner
        up, up, up, MG
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Bulls Eye Rockets
    secret move #1: Road Runner
        up, down, down, MG
    secret move #2: Stampede
        up, down, up, MG
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Sky Hammer Mortar
    secret move #1: Turtle Turnover
        down, down, down, MG
    secret move #2: Crater Maker
        down, down, up, MG
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Bruiser Cannon
    secret move #1: Cow Puncher
        down, up, down, MG
    secret move #2: Buckshot
        down, up, up, MG
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Road kill Mines
    secret move #1: Bear Hug
        left, right, down, MG
    secret move #2: Cactus Patch
        left, right, up, MG

Secret Vehicle
So you thought there was only 12 vehicles in V8? Well PSX Nation will tell you how to get the 13th secret vehicle which is an awesome UFO. In order to obtain the UFO vehicle you must beat every single quest mode with each of the eight initial vehicles then with each of the four extra vehicles. Once completed you will obtain two new areas plus the UFO vehicle. The UFO's player name is Y the Alien and he is awesome!!