Do I need to remove my OEM grille to install this?

Yes. Your factory grille unbolts from behind the bumper opening. Transfer any clips or brackets to the new grille if needed, then bolt it in place using the same holes.

Will this grille restrict airflow to my radiator?

No. The honeycomb mesh is open enough to let air through. Think of it like a screen — it blocks debris but not cooling airflow.

Can I repaint or customize the matte black finish?

The matte coating can be painted over. Clean and lightly scuff the surface with fine sandpaper if you plan to apply a different color or gloss level.