Will this fit if I'm not running the ZR bumper cover?

No — this lip is designed exclusively for the ZR edition front bumper. The mounting points and gaps are engineered around that specific bumper profile. Verify your bumper model before ordering.

Do I need to sand this before painting?

Yes. Sand and prep the surface with your preferred sandpaper before applying primer and topcoat. This ensures adhesion and a professional finish.

Will this lip sit flush at highway speeds?

FRP lips are rigid and won't flex or lift when properly mounted to factory attachment points. Ensure all fasteners are tight and that the bumper itself is securely fastened before driving.