This is odd. I had mine on for over 6 months and had them at their lowest setting tucking tires on my CE28s and never had clunking issues or leaking issues. They performed flawlessly.
I do recall from the E46 M3 days that they had some issues but hadn't heard anything on the Z4M. You are one of probably thousands of owners I have heard of since 2007 that has had serious issue such as this.
Either a mistake in the installation or you got a bad set.
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2020 Land Rover Velar Autobiography
2023 BMW M4
2016 X3
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