All I can add is that the M Sport suspension with runflats is terrible. I am not sure if the main contributing factor is the tire or suspension but I find the ride to be loud (tires) and harsh yet without the handling benefits. As soon as possible I am going to replace the M Sport with Bilstein coilovers. I dont have Xdrive.
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My build thread
2015 428i GC - Alpine White - Coral Red - M Sport
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