To Install:
1. Extract speciale_sign_2 into any desired directory, or simply, put it in your desktop
2. Using OpenIV, go to : mods/update/x64/dlcpacks/v4sp/dlc.rpf/x64/vehicles/
3. You should be able to find v4sp.ytd then right click, and select edit
4. A new window will pop up, select import, then choose speciale_sign_2 to replace the original
5. Don't forget to save before exiting.
6. After launching the game you will find this mod as 2nd livery in paint. Then select primary and secondary color to matte black.

(Remember to make a backup in case you missed or still prefer the original livery)

Credits : Joe_Garage-MOD ( Twatchai ) : https://www.gta5-mods.com/users/Twatchai
Original Mod : https://www.gta5-mods.com/vehicles/2018-ducati-v4-speciale-add-on-tuning-template