Roush 421405 Mustang Rear Side Splitter Kit Creates an aggressive styling line between the sides of the vehicle and the road; Compliments the ROUSH side rocker splitters (Part # 420092); Fits all 2013-2014 Mustangs including the GT, GT500, V6, Boss 302 and California Special Made of injection molded TPO plastic with a black stipple finish for an OEM look and long lasting durability and flexibility; Benefits of TPO plastic (Thermoplastic Poly Olefin) include: Excellent impact resistant, tough yet flexible, easy colorability, low density and light weight Comes unpainted with grained texture to increase longevity against rock impacts from driving; Does not require paint; Designed with OEM CAD data to ensure precise fitment Includes all required hardware, templates and instructions; Easy installation (Estimated installation time  less than 1 hour); 90-Day ROUSH Parts Limited Warranty Part # 421405