Will this interfere with my factory bumper or trunk seal?

No. The RKS profile is designed to integrate with stock bumper geometry and does not extend into the trunk line or affect lower seal compression. Verify clearance by dry-fitting against your bumper fascia before final adhesive or fastener installation.

Should I use adhesive or drill through the bumper to mount this?

Both methods work depending on your preference. Adhesive (polyurethane or epoxy-based) offers a clean, non-invasive install if you plan to remove it later. Drilling and bolting provides permanent, vibration-resistant security. Whichever route you choose, prep the mounting surface thoroughly and allow full cure time before driving.

Will this stay stable at highway speeds?

Yes, when properly secured. FRP is rigid and lightweight — once fastened or adhesive-bonded, it will not flex, rattle, or shift. Ensure all mounting points are fully engaged and your adhesive or fasteners are fully cured before sustained driving.