Will this interfere with the OEM bumper or trunk seal?

No. The Zaga lip is designed to sit cleanly below the M Sport bumper line without contacting the front fender or hood. Verify your bumper is in stock condition before installation — aftermarket or modified bumpers may require fitment verification.

Should I use adhesive or drill through the bumper to secure this?

Both methods are common for FRP lips. Adhesive bonding (polyurethane-based trim cement) offers a clean look with no bumper penetration. Mechanical fastening through the bumper provides redundancy. Choose based on your comfort level and whether you plan future removal — adhesive is easier to reverse.

How stable is this at highway speed?

FRP lips are rigid once fully cured and properly bonded. Ensure all contact points are fully seated and adhesive or fasteners are fully set before highway driving. The two-piece design allows you to address any rattle points independently if needed after installation.