This is update for unmarked police car from VW Golf 5 pack.
LED Police light on roof (remove with key r)
US police siren (key numpad 7)
D police siren (key numpad 4)
Driving is still not so good and I am working on it
Credits: Script: FSgamer, Vertex-Dezign
FS17_GolfGTI_Unmarked_Police (file size = 19 MB)