The vehicles I am using are for MP, so I had to dublicate the excisting model and make a new ~damaged permutation in the gbx.model menu in guerilla. So, when I test in game, the vehicles behave just fine except the momment they "die". Any suggestions on how to fix this? Anything I am doing wrong?

collision information doesn't sync, the only thing that syncs if vehicle location. What you need to do is chain spawn things, so a new vehicle that is dead is created on the server and then client. take a Look at H2 Coagulation, it has the most complete vehicle death effects out of any map.

Zigarisu had the best working destructible vehicles in MP that i have seen in halomaps using this script:

(script continuous void (sleep
(begin
(object_create_anew warthog1)
(object_create_anew warthog2)
(object_create_anew ghost1)
(object_create_anew ghost2)
(object_create_anew banshee1)
(object_create_anew banshee2)
(object_create_anew mogoose1)
(object_create_anew mogoose2)
(sleep 5000)))

Everything spawned fine after been destroyed in his map.

Good luck getting him to do that lol your not dennis.