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Hi everyone! I have a 323ci, and my back speaker deck rattles terribly.. I just replaced the speakers with brand new hardon karmon speakers, so I am positive they are not blown. I am almost positive it is the defrost vent on rear deck.. How do I remove/fix this? Thanks
 

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Search "tennis ball mod" I did it and now more trunk rattle for me. I'm actually pretty sure someone posted a DIY thread on exactly how to do it but you shouldn't need that as it is a very simple mod. Good luck and I hope this helped


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Taking off that rear deck is a lengthy process but not difficult. Yes tennis ball mod should solve your problem
 

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+1 tennis ball mod. Been fixed for a year. Cheapest easiest fix for any E46:

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+2. I have sound deadening in my entire trunk but I was still having some vibrations in the top parcel where the rear speakers mount to. I took out my rear speakers and ski pass to let more bass in the cabin but it made the parcel shelf resonate. Tennis ball mod finished the job.
 
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