Will this interfere with my trunk seal or undercarriage?

No — the front lip mounts to the front bumper only and does not extend into the wheel well or undercarriage. Verify clearance to your driveway approach angle before final install if you have a low stance setup.

Can I use adhesive instead of drilling through the bumper?

This lip is designed for factory mounting point fastening. If you prefer adhesive-only installation, prepare both the bumper and lip with light sanding and a quality automotive-grade epoxy — this approach trades some structural rigidity for a no-drill install.

How does FRP hold up at highway speeds?

FRP panels are engineered to flex with bumper movement and resist vibration cracking. At speed, road noise and wind buffeting are normal; if you experience movement or rattling, check all fasteners and ensure factory mounting points are fully seated.