Will I need to drill or modify the lower valance for sensor cutouts?

This cover is designed to work with OEM sensor placement. You will need to cut sensor holes to match your vehicle's existing bumper bar layout during prep; the cover arrives as a solid panel.

Does this cover fog light openings, or do I need to cut those out?

The cover ships solid. You'll need to cut fog light apertures to align with your bumper bar before painting, matching the opening size and position of your vehicle's original design.

Should I paint this before or after installation?

Painting before install is recommended — it ensures even coverage, easier masking of mounting areas, and protects seams during the cure process. Once cured, you can bolt it on and touch up any hardware areas as needed.