What is vehicle audio DL?
This page will explain what vehicle audio DL is and what functionality it serves in UG:MP and UG in general.
For starters, vehicleaudio.dat is the file that stores all of the vehicle audio settings. Here you will find the vehicle's engine sounds, door sounds, and other audio parameters. The format of this file is identical to that of fastman92's limit adjuster as well as fastman92's vehicle audio loader. The latter has been used as early as 2011 by GTA: United. This format is thus pretty well-known by modders and follows an internal game structure (and isn't invented).
Just like with other DL components, it is entirely possible to both add and replace vehicle audio settings for vehicles.
Click on this page to get started and to create your own vehicleaudio.dat file.