Will this interfere with the trunk seal or rear panel when installed?

The Vader lip mounts below the bumper line and does not contact the trunk lid or weatherstripping. Clearance is built into the design, but final fitment depends on your existing bumper condition and any prior damage or modifications.

Does this cover or block the brake light area?

No. This is a lower rear diffuser and does not extend into the brake light cutout zone. Your factory lights remain fully visible and functional.

What's the best way to mount this—adhesive or fasteners?

FRP diffusers of this type typically respond well to mechanical fasteners (bolts or self-tapping screws) through factory mounting points or reinforced zones. Adhesive alone is not recommended for this application, as road vibration and thermal cycling will eventually cause separation. Consult a fabricator if mounting points are unclear.