To quote a Swedish CSR owner, "they will add at least 50g of downforce", the official Caterham blurb for the CSR was Aerodynamics Aerodynamic improvements have majored on the face of the famous Seven. The introduction of re-profiled cycle wings, which are mounted even closer to the tyre to cut drag, and a new larger nose cone complete with a floor mounted chin, have combined to reduce the front end lift by 50 percent. The net effect for the driver is a major decrease in high-speed understeer. But no mention of the winglets, there are several claims that the winglets help with understeer, but can't find any proper tested numbers, but they are carbon therefore they must work