I created my dlc.rpf, inside dlc.rpf/levels/gta5/vehicles/vehicles.rpf i have my .ytd & .ytf files.
When i test the models ingame they work correctly, but when I add a custom carcols.meta inside dlc.rpf/common/data the sirens are not working, I tried using a siren value from game and a siren value that doesn't exists. Both doesn't work.