Will this interfere with my trunk seal or exhaust heat shield at speed?

No. This lip mounts to the bumper fascia only and clears the undercarriage structure. Verify ground clearance on your specific vehicle setup — some lowered suspensions may require a slight trim at the ramp edge. Sand and test-fit before final paint to confirm clearance over speed bumps and driveway approaches.

Do I need to drill the bumper to install this?

No drilling of the bumper required. This lip uses the factory mounting points already present on your OEM bumper. You'll bolt it on using existing hardware holes. Check your service manual for the specific fastener locations if you're unfamiliar with the bumper structure.

Should I use adhesive or fasteners to secure this?

Fasteners are the recommended route — they're adjustable, removable, and won't fail under thermal cycling or road vibration. If you prefer adhesive, sand the mounting surface thoroughly and use a two-part epoxy rated for plastic-to-plastic bonding. A hybrid approach — epoxy plus four fasteners at stress points — gives you the most security long-term.