AutoTecknic Dry Carbon Downforce Wheel-Well Splitters - UniversalProduct Description The AutoTecknic dry carbon downforce aiding wheel well splitter is made for race engineered and high performance vehicles in mind. Our dry carbon downforce wheel well splitters are used to fine tune the front aerodynamics of a race car or street car that may already be modified with a rear wing or other rear aerodynamic devices such as a rear diffuser. This wheel well splitter provides two benefits to the high performance vehicles