- Space Coast, Florida, beach side lol
No, as far as I'm aware that's normal, intended functionality. Any car with an [R] in the menus has a RM part equipped, therefore it can be shown in the tuning shop.
Technically the texture isn't even greyscale, it has no concept of shade or colour at all. It's just abstract colour indexes that mean nothing without the model to assign a colour palette to them. That's what makes CDP tooling so difficult, it doesn't really exist as a standalone texture.
If the decals are on their own palette you can just set the whole thing to transparent (0,0,0), but if they're combined with something else they'd need to be painted out on the texture.
Huh, because for me not all [R] cars show the rm in the tuning shop, only certain ones.
And OK got it.