Will this interfere with a lower bumper panel or undertray?

Check your OEM bumper geometry before installation. The GT500 profile extends lower than base models, so verify clearance with any factory undertray or air dam you're running. Mock-fit the panel and test fitment points where the lip connects to avoid contact.

Should I use adhesive or drill through the mounting points?

Both methods work depending on your preference. Adhesive offers a cleaner install with no new holes, while through-bolt mounting provides permanent security. Carbon fiber handles both approaches well — sand the mounting surface lightly before adhesive application, or drill pilot holes if fastening with hardware.

How stable is this at highway speeds?

One-piece carbon fiber construction keeps the panel rigid under high speed airflow. Monitor fastener torque regularly if bolted, and inspect adhesive seams periodically if glued. The weight savings actually improves front-end responsiveness without compromising structural integrity at freeway speeds.