Will this lip interfere with the trunk seal or rear bumper fitment?

No. This is a front lip—it mounts to the front bumper fascia and does not overlap trunk or rear suspension areas. Confirm your bumper is in stock condition before installation; heavily modified or damaged front fascias may require alignment checks.

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

Both methods work depending on your setup and reversibility preference. Adhesive (polyurethane or silicone-based) is non-invasive and ideal for stock bumpers. Drill-through fastening offers permanent security if you plan to keep the lip long-term. Verify your bumper thickness and material before choosing; most stock fascias are thin plastic and handle epoxy adhesive well, but drilling requires pilot holes and backing plates to prevent cracking.

Will the lip stay stable at highway speeds or on uneven road surfaces?

FRP lips are stiff and hold their shape well when properly mounted. Secure installation—whether adhesive or fastened—is critical. A loose lip can flex and separate. Check your mounting every few hundred miles in the first month, and avoid rough terrain or speed bumps until you've confirmed the install is solid. Road salt and debris can accumulate underneath, so periodic cleaning extends the life of both the lip and its mounting points.