RKP-F90-TS RKP F90 M5 Trunk SpoilerOne of the most effective ways to weigh product design is to measure how it is perceived over a long period of time. There are countless aero products that have initial shock and awe value, but lose their panache as they age. With RKP, our design philosophy has been rooted in creating a lasting effect, a truly timeless design that can be enjoyed and admired for years to come. As physical testaments of our design success, our E9X M3 and F10 M5 programs