Will this interfere with the trunk seal or bumper panel?

No. The GMX lip is designed as a bolt-on addition to the factory bumper structure. Before installation, verify your vehicle's bumper cutout alignment and test fitment with the lip positioned at the mounting points — this confirms clearance with your specific bumper assembly.

Should I use adhesive or drill through the bumper?

This design uses factory bolt holes for secure attachment. Drilling or adhesive application is not required. Bolt mounting provides repeatable fitment and allows removal without permanent modification.

How stable is carbon fiber at highway speed?

Carbon fiber is rigid and holds its shape under load. The single-piece construction and proper bolt-down technique ensure the lip stays flush with the bumper during normal highway driving. Confirm all fasteners are snug before your first drive, then check periodically as part of routine maintenance.