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I can say from my experience after the service I felt a pretty big increase in torque and can now hear turbo sounds that I didn't before. After service I drove the first 50 miles the same as I had during the break-in process. I suspect that what they turn on is the additional torque function and perhaps offer up more boost. All I know for sure is the service took over an hour from the time the tech got it because they had to reprogram the car and when I got it back it had more power than before. I had a baseline to work from also because I spent 2 days driving it a M School so I have driven several M2's.
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