Cheats for Need for Speed 3
cars-enable all cars
elnino-race with the El Nino car
empire-enable the Empire city track
gofast-multiply engine power by 1.75
bullhorn-cops yell stuff at your in hot pursuit mode only
ecop- gives you the pursuit el nino cop car
dcop- gives you the pursuit diablo cop car
rushhour- puts more traffic cars on the road

Traffic car cheats
Type one of these before you race in single-player single-race mode to drive one of these traffic cars
go01-Miata
go02-Toyota Landcruiser
go03-Cargo Truck
go04-BMW 5 series
go05-'71 Plymoth Cuda
go06-Ford Pickup with Canopy
go07-Jeep Cherokee
go08-Ford Aerostar Van
go09-64/65Mustang
go10-66 Chevy pickup
go11-Land Rover Discovery
go12-School Bus
go13-Caprice Classic Taxi
go14-Chevy Cargo Van
go15-Volvo Station Wagon
go16-Audi A6 Sedan
go17 -Crown Victoria Cop Car
go18-Misubishi Eclipse Cop Car
go19-Grand Am Cop Car
go20-Land Rover Discovery Cop Car
go21-Cargo Truck ( Same as go03 )