Will this interfere with the trunk seal or weather stripping?

The rear lip mounts to the lower bumper panel, so verify your trunk lid clearance during test-fit before final fastening. Measure from the lip edge to your trunk opening—most fitments clear without contact, but your specific vehicle setup may vary.

Can I drill through the FRP, or should I use adhesive?

FRP accepts both methods. Drilling works well if you align fasteners with reinforced mounting points; adhesive (two-part epoxy or automotive-grade polyurethane) works if you prefer no-drill installation. Clean the mounting surface thoroughly and allow full cure time before driving.

Will this stay stable at highway speeds?

Yes—single-piece FRP diffusers are engineered for road use. Proper installation and secure fastening are critical; verify all connection points are tight before highway driving, and inspect periodically for any movement or loosening.