Will this interfere with my trunk seal or undercarriage panels?

The FX lip mounts to the lower bumper using factory attachment points. Verify clearance between the lip extension and any undercarriage trim on your setup before final installation — factory bumper geometry may vary slightly by model year and regional spec.

Do I need to drill new holes, or does it use adhesive?

This lip is designed for bolt-on installation using existing factory mounting points. No drilling or permanent adhesive application required — you'll use fasteners at the OEM bumper attachment locations.

Will this affect stability or create drag at highway speed?

The FX profile is tuned for visual aggression with minimal aerodynamic penalty. At highway speeds, the short extension generates negligible lift or drag. Test fitment and ensure all fasteners are tight before extended driving.