Will this lip interfere with my trunk seal or undercarriage?

No — this is a front lip spoiler mounted to the lower fascia, not a full-width splitter. It sits ahead of the vehicle's main body and does not contact the trunk seal, suspension, or undercarriage components.

Does the front lip affect my brake light visibility or cutout?

No. The front lip is positioned at the lower bumper and does not cover or obstruct any rear lighting. Brake light function remains unchanged.

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

Refer to the mounting holes on your vehicle's existing front bumper. Most installations use the factory attachment points. Verify your bumper's hole locations and fastener style before assembly to ensure a secure, clean fit.