Hey my bad man. It must have been something i messed up or was changing cars out too frequently. I wasn't having the texture issues until I installed your car. It really only happened after I spawned it in or occasionally when I loaded up LSPDFR. I deleted it and put a different car in its place and it kept doing it. So I wiped my GTA and reinstalled along with all my mods and cars including this one and it doesn't have the texture issue anymore. That's my bad.
I have a 2003 Mustang and when I saw this I was so excited. But then I installed it and was super disappointed. The outside and inside of it looks awesome. The engine, behind both bumpers, and under the car look awful. Not to mention every time I spawn this car in and get 10 feet down the road my textures fade in and out and eventually my game crashes. This was an awesome idea, but it needs a lot of work.
EDIT: I'm dumb. Ignore everything about the texture fade issue.