Maximum money: 
Press Up, Triangle, Down, X, Right, Square, Left, Circle, 
Select, Start on the controller two at the title screen. 

All parts: 
Press Right(2), Down, Up(2), Left, Down, Left, Circle, 
Triangle on controller two at the title screen. 

Secret parts:
Press Up, Down(2), Up, Left, Right, Left, Right on 
controller two at the title screen.