To get the F16 and the Stealth, at the title screen press and hold R1 and L2 on controller two, then tap the Select button 20 times. An electronic noise will sound if done correctly.
Change the GeeBee's Stats
At the Loading screen with the little airplanes flying across, keep pressing X quickly. If you hit the buttons fast enough. the little airplanes will fly faster and higher. When they get near the top, the screen will flash good.
More Time
During gameplay, press R2 or L2 to roll. Everytime you roll, you gain an extra 2 seconds.