From what I have read and experienced, all Zeds have some sort of rattle or noise. I hear a rattle when going over a rough road as well, and mine is near brand new. Dealership was of no help. If you feel comfortable taking apart your car and working on it yourself there are a few people on bimmerfest that have tons of DIY fixes for annoyances like that.
Sorry if this isn't what you wanted to hear.
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2007 Z4 3.0si Coupe • 6 MT • Black Saphire Metallic • PP • SP
2016 GMC Sierra SLT Z71 Premium Plus 4x4
2017 Harley StreetGlide • Denim Black • V&H Tune
2021 BMW x30i • Phytonic Blue Metallic • Fully loaded
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