Interesting technical excerpt from Alpina regarding the aerodynamics of the RS:
Quote: "Basically this allows the amount of lift to be monitored as the car appears lighter as it gains speed the net effect of the lift being exerted on the car. Obviously ALPINA is trying to reduce lift in this test and so far the most successful car in terms of mift reduction they have done is the Roadster S (based on the BMW Z4) in which they have decreased lift by 64% front, and 77% rear, meaning that at 100mph lift is only single digits in kilograms"°.
Quote: "Basically this allows the amount of lift to be monitored as the car appears lighter as it gains speed the net effect of the lift being exerted on the car. Obviously ALPINA is trying to reduce lift in this test and so far the most successful car in terms of mift reduction they have done is the Roadster S (based on the BMW Z4) in which they have decreased lift by 64% front, and 77% rear, meaning that at 100mph lift is only single digits in kilograms"°.