A strange problem and first time its ever happened during my entire modding experience.
Does anybody know why it does this?
Faces are not flipped, Re-imported DFF into 3ds max and it is definately corrupted mesh.
Looks normal in 3ds max - no errors and material settings "seems" to be good.
Okay sorry - Turns out some of the faces are flipped. I had the perspective window rendering "flat" - changed to Smooth + Highlights and saw flipped faces.
I flipped them the right way but the model still seems to be messed up. It even looks like some vertices have been stretched to the other side of the vehicle