RKP Carbon Fibre Side Skirts - BMW 3 Series F80 M3RKP Composites has emerged as an industry leader of top quality US and German made carbon fiber products, starting with an excellent development history in the E92 M3 market. RKP was responsible for bringing M3 GTS and M3 GT4 racing parts to US M3 owners, and made the transition to developing body and aerodynamic components for modern generation BMW vehicles. With each component, RKP seeks to develop a purposeful design that accentuates and