Will this interfere with the trunk or liftgate seal?

No. This rear lip mounts under the bumper assembly and sits clear of the trunk opening. Verify ground clearance at your vehicle's ride height before final tightening.

Does this design stay stable at highway speed?

Yes. The one-piece FRP construction is rigid enough to handle sustained wind load. Proper mounting torque and fastener quality are essential—do not skip this step.

What's the best way to install this—adhesive or bolt-through?

Bolt-through is recommended for durability and adjustability. Adhesive-only mounting may flex over time with road vibration and thermal cycling. Always use corrosion-resistant fasteners.