Those codes in yellow are by MikroWerk. The codes in white are by ANDY4U2CALL@webtv.net. Thanks a bunch...

EKSOXV: Stupid computer cars (you'll win nearly every race 1st)
ASSOTI: New colors

KEPLET: Start with super turbo (100+m.p.h.).
NEPLET: Pick up a higher top speed icon and go super-fast. (Don't pick up another one).
GLIGTE: Get a turbo boost from touching sides.
ITELUY: Funny, jerky movements.
NAELUY: Another "jerky" code.
NTELUY: Another turbo code.
TIELUY: One more turbo code.
OVUXIA: Weirdness.
SELOPI: Computer controls you.
EXPLAI: You have an infinite roll cage, although it won't flash.
SKLAEY: Info on bottom of screen is wacky.
STXOEE: Nothing on tracks, can still finish a race, a turbo code listed above may be useful.
EKIPXV- Absolutely nothing on tracks, cars drag along sides.
ITAUUY- Go 111 m.p.h. through whole game no matter what. (Listen to that engine ROAR)!