Will this interfere with my trunk seal or rear bumper fitment?

No. This is a front lip that mounts to the lower front bumper area. It sits ahead of the trunk and does not contact rear-end panels or seals. Verify your bumper trim clips and lower fascia are in stock condition before installation.

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

This lip is designed for bolt-on installation using factory mounting points on the lower bumper. Bolting is the standard method—no adhesive or drilling required. Use the existing holes in your bumper fascia and tighten fasteners evenly to avoid panel stress.

Will this lip stay stable at highway speeds?

Yes. FRP is rigid enough to maintain shape under normal driving conditions. As long as all mounting bolts are tight and seated properly, the lip will not vibrate or separate. Check fastener torque after your first 100 miles of driving.