Will this interfere with the trunk seal or bumper fitment?

No. The front lip mounts at the factory fascia attachment points and sits below the main bumper body, leaving the trunk seal and upper bumper profile unaffected. Verify your OEM bumper is in standard condition before installation.

Do I need to drill holes, or does it use adhesive?

This lip uses the factory mounting points on the bumper fascia — no drilling or permanent adhesive required. You'll work with the existing bolt holes on your bumper. Check your vehicle's service manual or your bumper's manual for the exact fastener locations and specifications.

Will this affect my brake lights or rear reflectors?

No. This is a front lip spoiler and does not interact with rear lighting or reflector assemblies. It mounts entirely to the front bumper fascia.