NOTE: I did not make these car models, I edited their meta files and converted them into 2 separate fivem resources.
This is a pack that includes 2 unmarked police cars:
FBI - Unmarked Mercedes-AMG E63
FBI2 - Unmarked Cadillac Escalade
FBI Pack.rar (42.7 MB)
It’s converted into 2 FiveM resources, so you can just start them and you’re good to go.
Here are images of the cars in-game:
Credits:
Mercedes-Benz E63 AMG Unmarked Cruiser - DonFelipé - GTA5-Mods.com
Cadillac Escalade FBI Petrol Vehicle 2015 - cybkris - Cadillac Escalade FBI Petrol Vehicle 2015 [Replace] - GTA5-Mods.com