Installation

• Install quickbms along with the script called "nfsshift.bms".
  
• Install BFF Tools for NFS Shift.
  
• Go to the installation game folder (in my case, it's C:\Program Files (x86)\Electronic Arts\Need for Speed SHIFT), then go to Pakfiles -> Vehicles, then make a backup to the file called VehiclePersistent.bff under a different name should there's a problem with modifying the file.
  
• Using quickbms, extract VehiclePersistent.bff (you can extract and save in anywhere you want, I usually save it in C:\ for easier searching).
  
• Open vehicles folder that you just extracted, then open the vehicle folder associated to a certain boss (for instance, I want to have Kiyo Hironaga's livery into my car, and he drives a Mazda RX-7, so you need to open the folder called mazda_rx7).
  
• Open the .rcf file using MS Notepad, and you'll notice the livery 99 is reserved for the rival only. In order for their livery to be available to you, copy
  <NAME LIVERY="99" NAME="Rival Livery" />
  and paste it again (for the sake of convenience, I will put it below the Livery 4 hex), then rename the livery hex number after livery 4 (which in this case, it will be 10, since livery 4 is associated with hex number 9).
  
• Scroll down, then you'll see the code called
  <CONDITION LIVERY="99">
  <REPLACE TEXTURE="COMMON_PAINT.dds" NEWTEXTURE="MAZDA_RX7_LIVERY99.dds" />
  </CONDITION>
  You need to copy and paste it above this, and rename <CONDITION LIVERY> to the same number you assigned earlier.
  
• On <INPUT NAME="LIVERY" OPTIONS="4" />, you need to set OPTIONS to ="5" in order for the rival's livery to be selectable in the visuals menu.
  
• Save the file, then create a new folder to inject the modified car file back into VehiclePersistent.bff in the game folder (in my case, it's C:\To_Inject).
  
• Move the file into the new folder, then using BFF Tools, open BFFInject.exe, then on BFF Archive, select VehiclePersistent.bff on the installation game folder, then on Source Folder, select the top level source folder which contains the updated .rcf file (which in my case is C:\To_Inject).
  Please note that you should not browse to the sub-folders as they were created to match the location of the .rcf file inside the “VehiclesPersistent.bff” file.
  
• Click "Inject Now", and when the “BFFInject.exe” has finished injecting the .rcf file, you should see a message that 1 file was successfully injected.
  
• Launch the game, and enjoy racing with unique rivals' liveries.