INSTALL:
Open up OpenIV and press the edit buttom.
Then navigate to GTA V/mods/update/x64/dlcpacks/patchday4ng/dlc.rpf/x64/levels/gta5/vehicles.rpf

Stock Version:
Replace police3+hi.yft, police3.yft, police3_hi.ytd and police3.ytd from the "Stock" folder in to the vehicles.rpf folder.
Rebuild and start your game! Enjoy! 

Rocket Bunny Version: 
Same progress, replace all the files from the "Rocket Bunny" folder in to the vehicles.rpf folder.
Rebuild and start your game! Enjoy! 

Bugs:
Lights are incorrect (working on a fix for that)
Dials not working (still working on it..)
Some missing parts around the doors
The bodykit is missplaced but it will be fixed in the next update.

Updatelog V.1.1
Added a Rocket bunny version
Resized the wheels to match the kit

Next update:
Fix some textures
Liveries
Fix lights & Dials
Windows not breakable
And maybe make a small camber

Credits:
Model: p4elkin 
https://gta5-mods.com/users/p4elkin 
This version: DonFelipé

PS. If someone knows how to convert cars from FM3/FM4 to GTAV, please help me out...

Make sure to follow me for more updates on this mod and upcoming mods!
Have a nice day! :)