On the screen where you enter a password, enter L1, L1, R1, R1, R1. Begin a game and then quit. When you enter a new game, you will have unlimited specials for your character.

Homing rain missiles - Up,down,up,down,up
CPU cars fight eachother - L1,R1,L1,R1,R1
Slippery surfaces - Up,up,x,x,up

At the password screen press right, right, right, left, left. Minion will be next to Outlaw 3 on the car selection screen.

Enter the password left, left, left, right, right. Sweet Tooth will appear after Hammerhead.

Someone else sent in this code. I changed it cause they mixed up the code for sweet tooth and minion. They didn't give a name or email address.

Go to the password screen and enter triangle, up, circle, right, and start.

Enter the password start, L1, start, L1, start.

Enter down, L1, down, start, triangle, as your password.

Enter left, right, left, right, up at the password screen.

At the password screen enter L1,square, X, R1, and start.