Can you enter sponsor codes on burnout paradise downloaded version ps3?

There is a spot in one of the pause menus that says "enter sponsor code." You enter the code and you get the car that the code matches up with. For the WALL MART wtr racer enter wallmart, for circutcity hot rod enter circuitcity, and for the GameStop touge sport enter gamestop. I am not sure what the code is for the steel wheels gt it is a bunch of letters and numbers.