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Originally Posted by BG624
Aren't the tire diameters different between the 18" wheels and the 20's. You said you noticed better acceleration which would imply different (smaller) rolling diameters. If they are different (not sure if they are) you would need a software update and the speedometer would no longer be accurate. They do look amazing and give the car a whole different look. I would have ordered them too but I wanted All Season tires.
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The tire diameters of the stock 18", 19" and 20" tires for the E70 are within 2/10ths of an inch within of each other. This is a 0.7% delta in size. Your spedo is not that accurate to require recalibration.
Also, I doubt you feel actual improved acceleration. If anything, acceleration would decrease due to added weight of larger wheels & tires. But, since they make the X look hotter and faster, I'm sure there is a preceived increase in acceleration. Handling would improve of course.