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Figured it out, not a problem with the mod. User error. Great car!

@Dawas I'm willing to bet you don't have the update installed that has the Osiris. This Jaguar uses the sounds from the Osiris. To fix, navigate to:
update\x64\dlcpacks\dycep7\dlc.rpf\data\vehicles.meta

Open vehicles.meta with notepad++ or whatever you use to edit, and look where it says "audioNameHash". Whatever car you put there, the Jaguar will have the same sound effects. Save and Replace vehicles.meta and enjoy.

Car rolls over too easily.

No sound when driving? A 6.2L V8 should make sound my man. Any chance for that to be added?

Is it possible to make it so that when I take out a weapon the pedestrians don't all run away? None of them will even try to attack me once I take out a weapon and it is a little annoying.

I appreciate the responses and your level of activity with regard to these comments. It may sound silly, but this is by far my favorite GTA V mod right now. Once the final version is released and things are tweaked, it could be amazing. Keep at it bro!

I absolutely LOVE this script! I have only one complaint: whenever I set the squad to "Escort My Vehicle". After the NPCs get out of their vehicle to neutralize the threat and I begin to drive away, they begin to drive away and follow me BEFORE all the bodyguards get in the vehicle. This is kinda annoying because I wind up having the bodyguard vehicle follow me with only one bodyguard inside while the rest are on foot trying to catch up. If that could be fixed I'd greatly appreciate it!

Works. However it doesn't save the modifications made to the vehicle after visiting Los Santos Customs. Is there any way that could be added?