Will this interfere with my factory trunk seal or bumper cutouts?

The two-piece design mounts to the lower bumper area. Before installation, verify clearance with your vehicle's brake light housing and any existing cutouts in the bumper panel. Trim may be necessary depending on your specific bumper condition.

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

Both methods work; your choice depends on your bumper material and reversibility needs. Adhesive requires surface prep and allows removal without holes. Drilling provides permanent security. Either way, sand the mounting surfaces and allow proper cure time before driving.

Will this stay stable at highway speeds?

FRP lips are designed for street use when properly secured. Ensure all mounting points are fully engaged and fastened according to your installation method. Check the fitment after your first few drives to confirm everything remains tight.