I had it done last week and notice a real improvement.
Two strange things though:
1) I don't have a sports package, but now under settings I have sports mode with options for adjusting the drive train and chasis. I notice no difference in handling in sport mode, but the gear ratios do change putting me at a higher rpm. Should sports mode chasis control do anything on a car without any of the sports options?
2) Before getting this, I could scroll through my preset radio AM/FM/Serius stations via the steering wheel thumb scroll. Now I each time I start the car I have to switch Idrive to prests to get this feature. Otherwise it just scrolls through every station in the band I'm currently in.
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