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Message: <blockquote data-quote="///M5" data-source="post: 1265519" data-attributes="member: 562975"><p>Sounds like the design of your muffler and car body panels don't jive so well.  What I meant by body panel modes was that at 200Hz I bet your roof or some other structure in your car is extremely active (acting like a big *** passive radiator) and causing issues.  Those would be body modes.  If it was standing waves in the interior cranking down a few windows should change them which is why I asked.  From your description either you need to change your exhaust or really mass load the panels in your car to raise their resonant frequency.</p></blockquote><p></p>

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