The center lip is just a piece that lays directly ontop of the splitter and the bolts go through both the splitter and lip then have carbon fiber spacers (5) between the lip and the body of the car. The purpose of those is to hide the 5 Boyle’s that are used to bolt these both to the underbody of the front bumper. The bolts go through the center the spacers which are hollow tubes wrapped in carbon fiber or whatever the person chose. Then the sides of the splitter by the wheels are bolted there.