I just looked at mine and my "Wheels and Drive" section in the VIN decoder shows this:
Quote:
Wheels And Drive
S22EA BMW LA Wheel M Double Spoke 668
S248A Steering Wheel Heater
S2VBA Tire Pressure Display
S2VWA M Sports Suspension Professional
S2NHA M Sport Brakes
S2TBA Sport Automatic Transmission
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M550 with DHP/IAS and unless my mind is playing tricks on me, IAS is definitely installed on my car.
I can tell because:
a) I back into parking spots a lot in all kinds of cars, but kept "missing" the first few weeks of having the car. It was turning sharper than I expected due to the IAS.
b) When leaving my house I have to back out into the street. Sometimes I stop to get the mail before driving off. If I do this with the wheel still turned to come out of the driveway, you can actually see the rear wheels turned every so slightly opposite from the front (but you have to really eyeball down the side of the car to notice it).