Let me introduce you this BMW 540i xDrive with a livery of the Luxembourg police.
Single player :
1. Open OpenIV and go to :[Gamefolder\Update/Update.rpf/x64/dlcpacks/patchday18ng/dlc.rpf/x64/levels/gta5/vehicles.rpf
2. Search for the police2.ytd file and open it with OpenIV
3. Search "bmw_sign_1" inside and replace this file by my livery.
3. Save and quit OpenIV and lunch your game
4. Use a trainer to choose the livery in-game, enjoy
Please do not edit this file and re-upload claiming its your work,
if you decide to use this livery in a video please provide links to this file thanks you.
-----THINGS TO CHANGE-----
BritishGamer88 for the vehicle
If you appreciate the livery don't forget to tell me in the comments and rating the paintjob thanks