Will this lip interfere with my trunk seal or bumper panel when closing?

No — OEM-proportioned design sits flush with the factory bumper line. Verify clearance by dry-fitting before bonding. Check your bumper panel alignment; any existing gaps will carry through to the new lip.

Should I use adhesive bonding or drill through for installation?

Both methods work. Adhesive is cleaner and reversible; drilling creates a permanent bond. Choose based on your long-term plans for the car. Either way, the OEM mounting points on your bumper will guide hole placement if you go the drill route.

How stable is this at highway speeds?

FRP construction is rigid and won't flex or rattle once properly mounted. Secure adhesive or bolts will keep it locked in place. The low-profile OEM design creates minimal lift or drag.