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Plastic hardware is included to attach the splitter. There are 20+ fasteners so the splitter is held on solidly, and plastic is used here so that if you hit something the fasteners will break and the splitter will not take the expensive bumper with it. However, if you scrape the underside on curbs or if you bump into something with the splitter you can weaken the plastic fasteners. As such, you should be checking/replacing them as necessary if you scrape or bump into anything. The alternative is to use solid nuts/bolts to hold the splitter on, but you do so at some risk that if you hit something with the splitter it can damage the bumper as well.
Made for Good-Win Racing by DG MotorSports