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my dealer replaced the roof and it made no difference ! the issue is caused by the back section of the roof moving slightly or fidgeting one solution is to pad between the bottom section of the roof and the body with vinyl flooring cut into strips stuck down and an appropriate colour to blend in aim for a thickness of 12mm or more if reqd this braces the roof and stops the fidgeting , the dealers dont seem to have an answer and i have to say that mercedes slk and mazda mx5 power roofs are noise free as they sit below the boot line not on top of the body like the z4 and must be stiffer as a result
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