20mm should be no problem. any more and then be careful of multi storey car parks and speed humps. Check your insurance too, as they get nervous about it, especially over 25mm. I lowered my e36 M3 by 50mm for the track and it was basically undriveable on anything other than main roads.
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2014 M235i / EB-II / Coral / Sunroof / Comfort & Parking Packages
2014 X3 3.0d / M sport / AW / Sunroof
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