Will this interfere with my trunk seal or lower bumper clearance?

Front lip spoilers sit below the bumper edge and do not contact the trunk seal. Check your M-Sport bumper's lower contour and any existing trim pieces before final installation to ensure adequate clearance with your suspension setup and ride height.

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

This lip is designed for bolt-on installation through existing M-Sport bumper mounting points. Review your bumper's factory hole locations before assembly; drilling additional holes is not necessary if you use the OEM mounting structure.

How stable is carbon fiber at highway speeds?

Real carbon fiber is rigid and will not flex or rattle once properly secured. Ensure all fasteners are tight and that mounting points are fully seated against the bumper surface. Periodic checks after 500 miles will confirm stability under sustained driving.