All bmw's have an insane negative camber. It's for stability and I think Kirby (??) explained it... but you need a good bit of negative camber becuase the entire surface (from the inside to the outside sidewalls) never touches the road - only a little bit. So when you go into a curve and the car leans, less/more touches the road. So by having negative camber, one of the wheels maintains as much contact as possible, versus only having maybe 20% contact.