Flat or satin but I would go with the gloss all depends on what you like
Can you post some pictures of this?the oem frame paint is a satin black with a very small metalic in it, but a good part of it is laid on cast which has a somewhat textured feel to it. I had mine powdercoated crinkle-black and it looks like it could have come from the factory that way....im really happy with the way it looks and it is supper hard!