Will this grille work with my aftermarket front bumper?

This grille is designed for OEM bumper integration. If you've swapped to an aftermarket bumper, test-fit first to confirm alignment—some bumper designs alter mounting geometry.

Do I need to remove the old grille, or can I layer this over it?

The old grille needs to come out. Remove fasteners at the factory mounting points, slide out the original, and bolt this one in using the same holes.

Can I paint this, or is the finish final?

The textured black is ready to install as-is. If you want a different color, you can sand and paint it—just prep the surface per your paint system's requirements.