These are some cheat codes I had since Screamer first came out. Great Game!
Type at the Main Menu.
"VTELO" - Makes all the tracks available.
"INVER" - Adds the old tracks as new ones - in reverse.
"MONTY" - Changes the orange cones into rabbits,dolls and baby carriages.
"CLOCKS" - Turns off the clock.
"TAZOR" - This one gets you the Bullet Car.
"ABURN" - All cars in the race are Bullet Cars. Warning - once you invoke this cheat code, you can't turn it off without restarting the game.

Re: The ABURN cheat

You can change the Difficulty in the Options menu from "Afterburner" back to the original Easy, Medium, Hard to undo this cheat.

Sorry to be picky, just I was something of a die-hard fan of this way back when..