Will this interfere with my trunk lid when it's open?

The front lip sits below the bumper line and does not extend rearward, so trunk operation is not affected. Verify clearance with your own bumper configuration before final installation.

Can I use adhesive, or do I need to drill mounting holes?

This lip is designed to use your vehicle's factory mounting points, which are bolt-through. Verify that your bumper's existing fastener locations align with the lip's mounting tabs before installation.

Will this stay stable at highway speeds?

FRP is rigid and lightweight. Proper torque on all fasteners and correct alignment with factory points ensure structural stability. Check all bolts periodically, especially in the first 500 miles, and retorque as needed.