First: Download and install the SAHP Ruiner mod by 11john11 

https://www.gta5-mods.com/vehicles/imponte-ruiner-sahp-pursuit-unit-add-on-11john11

Second: Navigate to Grand Theft Auto V\mods\update\x64\dlcpacks\hwayruiner\dlc.rpf\x64\levels\gta5\vehicles\vehicles.rpf\  

Third: Replace the hwayruiner.ytd file with the one I have provided