Will this interfere with my trunk seal or brake lights?

No. This rear lip attaches above the bumper and does not block the trunk opening or extend into the light assembly area. Verify your specific bumper cutout location before final mounting to ensure clearance with any aftermarket lighting.

Should I glue this on or drill through the bumper?

This lip is designed to mount through existing factory bumper fastener holes — no adhesive needed. Use the OEM mounting points and standard hardware to secure it. Drilling additional holes is not required.

Will this stay stable at highway speed?

Yes. FRP is rigid enough to maintain its shape under normal driving conditions. Once mounted securely through factory points, it will not flex or rattle. Ensure all fasteners are tight before driving.