Maybe mine is broken... I could not say I notice any difference.
Will have to look at this a little closer.
Current: 2013 F30 320D M Sport AW, 403M 19", Bi-Xenon, Black Leather
2005 E91 320D M sport, BSM, Twist 230 19's, Lemon Leather. Death by Swirl Flap
2002 E46 320i M Sport, Convertible, Titanuim Silver, 19's, Xenon, Black Nappa Leather
1998 Lotus Elise 111S, Black