Thats not a texture thing its a col thing, the models are all made of (mostly) of a txd, dff and a col, the col is obviously short for collision its the shape in the physical environment you can't see, the txd is the texture/textures over the model/models (each txd can be for many dff's) and the dff is the shape of the model that you can see but R* made the cols with much smaller poly counts (less detail) but totally fucked some of them up.
Just telling you how it is in detail to help you understand a little better .
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