Will this grille work with my truck's front bumper as-is?

Yes — it's designed to fit the factory opening on Titan and Armada models in this generation. Your existing bumper surround stays in place; this grille bolts directly into the standard mounting points.

Do I need to drill or modify anything to install this?

No drilling required. The grille uses the factory bolt holes on your truck. You'll need basic hand tools and roughly 15 minutes to remove the old grille and bolt this one on.

Can I repaint the black sections or is the finish permanent?

The finish can be sanded and repainted if you want a different color — treat it like any plastic or composite panel. If you're keeping the two-tone look, no prep or paint is needed out of the box.