Note: The original O.P.P D&R Intimidator police siren mod for GTA 4 belongs to Laikmuay. However I did some very minor edits and tweaks for the siren sound mod to work in GTA 5. So all credit goes to him.

This is a D&R Intimidator siren sound mod to replace the main police sirens in the game.

0x0EA58C7C - Generic Bullhorn
0x0D329446 - Police Primary (Wail)
SIREN_2 - Police Secondary (Yelp)
POLICE_WARNING - Police Priority (Hyper-Yelp)

Be sure to download the latest version of OpenIV and run it as administrator

1 – Run OpenIV, Select GTA V for Windows. However be sure to locate the folder where the game have been installed.
2 – Find audio file you want to edit by going into x64 folder
3 - Then click on audio folder where you should see one folder and two files.
4 - Click on the sfx folder and then select and click on the file: RESIDENT.rpf
5 - Upon opening the RESIDENT.rpf file, you should see 16 items shown. One of them is the vehicles.awc file.
6 - Right click on vehicles.awc and export to openFormats (.oac) to any folder you like (e.g downloads folder).
7 - Extract the vehicles folder (containing the four audio files of the siren) from the .rar file to the same folder that was exported in.
8 – Afterwards, go to edit mode in OpenIV. There will be a warning upon editing mode so be careful.
9 - Import the .oac file by either draging the file to OpenIV or go to new and click on Import openFormats to select the .oac file then click on open.
10 - Click on ok
11 - Click on edit mode again (if you are in edit mode already) to exit edit mode.
12 - To ensure everything works, click on the vehicles.oac file twice and click on either 0x0D329446 or SIREN_2 to see if the files were successfully replaced.
13 - Exit OpenIV and play GTA V.

If you have any questions regarding this siren mod please let me know in the comments below. I hope you all like this. =)

Credits

Laikmuay