I downloaded this resource [Release] Custom server sided sounds then replaced the sounds with what I wanted. I also looked at how the file pathing and the __resource.lua was done and I added custom engine sounds. If you add this once you get into the server you may have to wait a for minuets for the new sounds to load.
Yeah, except your server users won’t hear it. Only you do. For example, we have a server sided sound script that changes the gun firing sounds. Sounds absolutely beast to me, but the other players here the regular sound when I fire.