I saw serveral cars with and without the M-suspension and the 10 mm lowering works well with 19 inch. For me this is enough but if you like it really low...
On my present Z4 I also have the M-suspension with 19 inch wheels and to me it looks the same as on the new one. But I have to mention that I use 235/35/19 - 265/30/19 which is just one size wider than the originals (225/35/19 - 255/30/19), which means they are also slightly higher...
Grtz
Ramius
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