Will this interfere with the trunk seal or hood clearance?

No. The front lip mounts to the lower bumper and does not extend into the hood or trunk area. Verify alignment with your bumper's existing mounting points before final tightening.

Can I use adhesive instead of drilling, or do I need to drill new holes?

This lip is designed to use factory mounting points — no new drilling required. Adhesive alone is not recommended; fasteners through the existing holes provide secure, long-term mounting.

Will this stay stable at highway speed?

Yes. When mounted properly through factory holes with fasteners, FRP front lips experience minimal airflow stress at normal highway speeds. Ensure all fasteners are tight and verify fitment to your bumper before extended driving.