Well, I have contacted my local dealer for this upgrade yesterday. He has asked BMW France. He sent me the official response this afternoon. Here in France, one has to perform this upgrade before registering the car i.e. when it is new and not already delivered. This is because when increasing the output power, the car is classified in another category. So, there is no (official) way to buy and install the S823A here in France.
Best regards
sl91
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F20 125i sport AT - adaptive suspension - June 2015
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