SP Install:

Open the OIV file with any software that can open a ZIP archive file
Drag the lamavgineng folder into GTAV/mods/update/x64/dlcpacks
Edit the dlclist.xml in GTAV/mods/update/update.rpf/common/data
Add the following line - <Item>dlcpacks:/lamavgineng/</Item>

Now, In order to use the mod do the following:
To use on any car, edit the vehicles.meta it is defined in, and replace this line with either;
<audioNameHash>lamavgineng</audioNameHash>

