Will this interfere with my trunk seal or undercarriage?

No. This lip mounts to the lower fascia and sits forward of the rocker and chassis. Once fitted, it clears trunk seals and suspension components. Double-check clearance with your specific suspension setup if running lowered springs or coilovers.

Can I install this using adhesive, or do I need to drill through the bumper?

This lip uses factory mounting points — no adhesive or drilling required. Align it with your OEM attachment holes and secure with fasteners appropriate for plastic-to-plastic or plastic-to-metal connections. Verify hole locations on your bumper before assembly.

Will this panel stay stable at highway speeds?

Yes. Once secured to factory mounting points, it remains rigid during normal driving. Ensure fasteners are tight and mounting points are clean and dry before final installation. Check tightness after the first 100 miles of driving.