If you go with stiffer springs to reduce body roll, you should either change to stiffer dampers, or run with adjustable dampers always in sport mode. Otherwise the car will be more bouncy, and be worse handling wise than stock.
I guess 225/45-18 would be possible, but it is not a good fit for the car. If the car is xDrive, it will definitely not work. 225/40-18 is the correct size.
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