Will this interfere with the trunk seal or bumper panel underneath?

The Supreme profile is designed to sit forward of the bumper bar and does not contact the trunk weatherstripping. Before installation, confirm clearance by test-fitting and checking for contact points along the full width of the panel.

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

FRP lips can be mounted with high-strength automotive adhesive or traditional fasteners. Adhesive installation preserves the panel finish and allows removal without fastener holes; drill-through offers permanent security if you plan long-term fitment. Choose based on your preference for reversibility.

How does this hold up at highway speeds?

FRP is rigid enough for highway use when properly secured. The single-piece design eliminates flex points that can develop at seams. Ensure mounting is tight and even across the full panel to avoid wind lift or vibration at sustained speeds.