To gain access to track 7 (you may have to qualify for the Rapier class) 
choose player 1 and then press and hold in the following order - L1 + R1 + 
right + start + square + circle + square. 

To access Rapier class highlight one-player and hold down L2, R2, Left 
on D-pad, Start , Select. Once these are held down, Press X

To access the Firestone class at the startup screen highlight "one 
player." Now press and hold L1, R1, START, Square, and R on the D-pad. 
Now hit X.

To be a turtle with hyper jets and infinite homing missles press and hold the 
following buttons at title screen: left , select , square , all L & R's , then X .