They had the car on Top Gear and the professional driver suggested that Koeningsegg adds a rear-wing. They did that and the driver got a much faster time. The downside is that it was not retractable of course since it wasn't originally designed into the car and that would bring down the top speed and the type of people who buy cars that expensive probably only do so to brag about the numbers.No if they only made it to handle a bit better and than maybe people could actually drive it witouth crashing it