NASCAR Racing '98

Shoot paintballs:
Pause game play and display the race statistics screen from the options menu. Hold L1+ R1 + L2 + R2 or press that combination of buttons several times. The sound of an engine will confirm correct code entry. Resume game play and press Triangle to shoot at the other cars.
Information in this section was contributed by punisher8081, Jordan Baker, John Thompson, and BaseballPlayr18.

Machine gun:
Pause game play as soon as the green flag drops and display the race statistics screen from the options menu. Hold L1+ R1 + L2 + R2 + Triangle or press that combination of buttons several times. The sound of an engine will confirm correct code entry. Resume game play and press Square to shoot at the other cars.
Information in this section was contributed by HotViper013.

Pinnacle Trading Cards car:
Select exhibition mode. Highlight Bobby Labonte's car on the car selection screen, then hold X and press Up, Down.

EA Sports car:
Select exhibition mode. Highlight Kenny Wallace's car on the car selection screen, then hold X and press Up, Down.
Information in this section was contributed by Tennmaine.

Turbo mode option:
Hold Circle and press Up, Left, Down, Right at the options screen. A new option that increases the game's frame rate will appear at the bottom of the screen.

Faster settings:
Enter the car setup screen and adjust the tire pressure to the maximum, wedge to the minimum, rear spoiler to the minimum, and gear ratios to the maximum.

Waving driver:
Select the view in which the driver and steering wheel are visible. Then, hold Triangle until the driver waves.

Hint: Shield of paint:
Enable the "Shoot paint balls" code, then do donuts while holding Triangle. It will make a shield of paint to make you unstoppable. Note: This is helpful on races where other cars are directly behind you, and attempting to move ahead.
Information in this section was contributed by Y2D1287.

Hint: Car position and speed:
Cars will have different speeds depending on what position you are in.
Information in this section was contributed by Kingdog819.

Position 24 to 21: The cars will be very slow and very easy to pass.

Position 20 to 13: The cars will be quicker and harder to pass, but you will be able to tell which cars are very fast and are very slow.

Position 12 to 2: The cars will be competitive and will be at relatively the same speed.

Position 1: A select amount of cars will be very quick and then there will be a huge change in speed for the CPU cars (usually from position 9 to 14). This is most noticeable at Bristol.