Quick Start:

Press X to accelerate when "1" appears during the pre-race countdown.

New Engine:

Go to time attack and beat all the countries, get a new engine for all cars!!!

Secret & Top Secret Menu:

In the options menu hold down Square and press: Up, Circle, Down, Circle, Left, Right, Left, Right, Circle. This opens up a secret menu on the options screen.

All Cars & More:

Enter NORTHEND as your name and it will open up a top secret menu in the secret menu ( you have to have opened the secret menu ) to access everything except medals.