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So my convertible 335i has had the worst rattle when the top is up ever since I bought the car. It has a muffler delete, and there is never a problem with rattles going over bumps, but when I***8217;m accelerating and am in the range of 1500 rpm to 2000 rpm there***8217;s a very loud rattle in the rear area of the top, sounds like it is right above the rear seats. Anyone have any ideas on how to solve this on my own, starting to get desperate.
 

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harmonic resonance. You need to ID the items that rattle and change their resonant frequency. Usually duct tape can do the trick!
 
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