Will this fit without any trimming or modification to my bumper cover?

Yes. This grille is engineered to mount at factory attachment points and fit within the stock grille opening. No cutting, drilling, or bumper work needed.

Does the matte black finish need touch-up or protection after install?

The matte finish ships ready to bolt on. Keep it clean and dry to maintain appearance. If you want added durability, a clear ceramic coat works well on matte surfaces, but it's optional.

Can I remove this and go back to the OEM grille later?

Completely reversible. It bolts in at the same factory points the original grille uses, so reinstalling the stock piece takes the same five minutes in reverse.