Do I need to remove my bumper cover to install this?

Yes, you'll need to remove the front bumper cover to access the mounting points where the bar sits. Once unbolted, the cover lifts away cleanly, the bar installs to factory attachment points, then the cover goes back on. Straightforward process with basic tools.

Will this work with a lower valance or splitter?

The reinforcement bar mounts behind the bumper cover itself, so it won't interfere with a lower valance or splitter. Test-fit any aftermarket lower pieces before final assembly to confirm clearance.

Can I paint this before installing it?

You can, but it's easier to install the unpainted bar first, then mask and spray your bumper cover assembly as one unit after installation. That way you avoid paint chips where bolts tighten down.