This adds cars from pre-order DLCs, Limited Edition and SCPD Rebels DLC pack.
This is NOT the unlocker that is already floating on the internet. This properly unlocks cars, meaning no saved games corruption and supposedly online support.
Put GAMELOGIC folder into NFSHP2010 installation folder and overwrite file GAMEPLAY.BNDL. Or manually overwrite that file in GAMELOGIC folder of the game.