Phanta

After a week to 10 days after the issue, trying everything I figured it out myself. The problem was that there seems to be a max amount of items there can be in the hierarchy. When you exceed that number, it starts doing really random stuff. I model my cars for FiveM mainly and test them in there, so I'm not sure if it's a problem with that, or if it's a known GTA problem in general, but combining some items that could be combined solved the issue for me. I don't know how it decides to randomly turn stuff into sirens, but another example I got with the problem was that when I added a bobble head, random stuff started bobbling:  https://gyazo.com/1298343af23828c1faba1de0e0544a44
So yeah. That was the issue. Thanks for getting back to me though 🙂

Dear Candice,
 
I fixed it. I was almost ready to give up. I went over everything in that post again, everything was as it was supposed to be. When I started comparing my base model to other CVPI dev models, I noticed that mine doesn't have a bodyshell, and what normally would be the bodyshell was merged with the chassis. Apparently bullets never show on the chassis itself, since it's always fully hidden by everything around it. Once I extracted the paint layer from the Chassis and made it into a Bodyshell, all works now. Learn something new every day. Thanks for your help, love your work! Thanks 🙂

take your collision mesh in vertex mode and select the grouped polygon nodes to stretch the cols over the vehicle mesh. if this doesn't work import in a default model swap out the COL and shape it to fit new model. 
 
 
http://forum.zmodeler3.com/viewtopic.php?f=31&t=7349 this is a forum post on collisions and what not, in case i missed something else