Hey what's up :)
[Note: Photo is of IV but this mod IS for V]

This siren is used by New Zealand Police, File includes an aftermarket Blow off Valve noise (for turbo tuned vehicles) and after market Ambulance and Fire truck sirens also credits to flyer2359x for the Firetruck and Ambo Sirens!


INSTALLATION


Open OpenIV

Select edit mode

x64 > Audio > SFX > Resident

Right click vehicles.awc > export to openFormats(.oac) to your desktop,

Select all files from the NZ Siren folder and
drag and drop them into vehicles folder and replace.

Go back to OpenIV (Making sure you're in Edit Mode)

Click new > import openformats >

Select vehicles.OAC file (Included) then click OK

Close OpenIV.

Enjoy :)


Note: This is ONLY for New Zealand POLICE Siren at this stage, working on a NZ Fire and NZ Ambulance Siren shortly!

Credits:
http://forums.nzvirtual.com/
https://www.facebook.com/groups/NZVirtual/
Credits to Caleb for making this siren for GTA IV.