NASCAR 99 Secrets and Codes (PSX)

NASCAR 99 is a racing simulator video game game developed and published by EA Sports and co-developed by Stormfront Studios. It was released for Nintendo 64 on September 11, 1998, and for the PlayStation on October 31, 1998. NASCAR 99 is the second game in the EA Sports NASCAR series of video games. The game contains several different features including:

37 Winston Cup drivers and 17 Winston Cup tracks
Custom car setups
Single race
Championship season
Six unlockable legendary drivers
Crew chief and spotter assistance
Interactive pit stop menu
Night racing at Bristol, Charlotte, and Richmond
24 car field
Crew chief and spotter assistance
Commentary by Bob Jenkins and Benny Parsons
Music by George Thorogood and the Destroyers, Stevie Ray Vaughan, Double Trouble, and Joe Satriani (Wikipedia)

Codes

Misc. Codes
Choose single race and select the Richmond track. Then, highlight Select Car and press R2, R2, L1, L1, L2, L2, R1, R1, R2, L1 - Benny Parsons' Car

Select Bristol and then highlight the Select Car option. Press R1, R1, R2, R2, Square, Square, Circle, Circle, X, X - Race as Alan Kulwicki

Select the Charlotte track and highlight the Select Car option. Press Left, Up, Right, Square, X, Circle, L1, L2, R1, R2 - Race as Bobby Allison

Select the Darlington track and highlight the Select Car option. Press Up, Up, Up, Square, Square, Square, Left, Circle, Circle, Left - Race as Cale Yarborough

Select the Talladega track and highlight the Select Car option. Press Up, X, Down, R1, Left, Circle, Right, Square, L2, R2 - Race as Davey Allison

Select the Martinsville Race and highlight the Select Car option. Press Up, R1, Right, Circle, Down, X, Left, Square, L1, R1 - Race as Richard Petty

At the race setup screen hold Circle and press Up, Left, Down, Right - Turbo Mode

Secrets

Waving Driver
Go to the inside car camera and press select and hold it for a few seconds. Your driver will wave to the drivers behind him.

Check out this glitch, from the Nintendo 64 version of the game: