Will this interfere with the trunk seal or undercarriage?

The Novarix profile is designed to sit at the factory bumper mounting points and clear the undercarriage. Verify clearance by checking your vehicle's OEM bumper structure before final installation — this ensures no contact with existing trim or ducting.

Can I drill through this lip to secure it, or should I use adhesive?

FRP can be drilled cleanly if you use a corded drill with a sharp bit and backing support — this prevents chipping. Alternatively, high-strength automotive adhesive rated for plastic-to-plastic bonding works well. Your choice depends on whether you want the lip removable later. Sand the bonding surface before applying either method.

How stable is this at highway speeds?

FRP is rigid and durable at speed when properly secured. A clean, full-contact installation — whether adhesive or fastened — ensures zero flexing. Inspect your mounting surface for gaps or misalignment during install; a solid fit eliminates wind noise and movement.