So here i have just posted some nfs cheats as my a start

Cheat Code	Result
tombstone	Daytona car
bomber	Bomber BFS car
fzr2000	FZR 2000 car
red racer	Ford Indigo
slip	Slow motion
pioneer	Pioneer engine
roadrage	Beep horn to crash opponent
hollywood	Monolithic studio track
madland	Different colors
kcjones	Multicolor car and horizon [Note 1]
chase	Chase mode
mad	Smoking cow tires [Note 1]
slot	Slot car mode [Note 2]
rain	Rain mode [Note 3]
rexrage	Dinosaur traffic
vip	Limousine traffic
schoolzone	School bus traffic
rushhour	Increased traffic
go[18 - 51]	Various objects
go18	School bus
go19	Pickup
go21	Truck
go23	Blue Sedan
go27	Green VW
go28	Grey convertible
go31	Mercedes Unimog army truck
go33	Yellow snow truck
go34	Tram
go35	Limousine
go40	Crate
go41	Hand cart
go42	Wooden stand
go43	Tyrannosaurus Rex
go44	Wild West wagon
go45	Souvenir stand
go46	Souvenir stand
go47	News stand
go48	Log
go49	Crate 1
go50	Beer box
go51	Rock

Note 1: 3Dfx version only

Note 2: A "Slot" option will be available under the player car menu in arcade or wild mode. Cars will automatically make turns in this mode.

Note 3: Rain will appear on Proving Grounds and Mystic Peaks tracks. Not available in the 3Dfx version.