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I going to guess that you did not have it done at a muffler shop. A muffler shop should be able to tack down any part of the system that is making contact with the body, in turn, causing the rattle. If thats the problem. If there is something loose within the muffler chamber, then thats a problem with Borla's quality control. Unforturnately, you would have to send the muffler back for an exchange and your out the money for the installation.
Have you or the shop determined exactly where the noise is coming from?
There is always something that can be done. Cecil........
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