NASCAR 50th Anniversary SE

Shoot Paintballs
Pause the game and display the race statistics screen. Then, hold L1 + L2 + R1 + R2. If done correctly, you will hear an engine sound. Now resume gameplay and press Triangle to shoot.
Pinnacle Trading Cards Car
At the Car Selection screen in exhibition mode, highlight Bobby Labonte's car. Then, hold X and press Up, Down.
EA Sports Car
At the Car Selection screen in exhibition mode, highlight Kenny Wallace's car. Then, hold X and press Up, Down.
Increase Frame Rate
At the Options screen, hold Circle and press Up, Left, Down, Right.
Waving Driver
While driving, select the view in which the driver and steering wheel are visible. Then, hold Triangle until the driver waves.