I too have had experience with the muffler getting a slightly louder tone the more I drive. I have experienced this on many other mufflers on different cars as well. It is something to do with the type of packing used. But that's about as much as I know about it but it does seem to get louder, however little it may be. But I don't think it will get much louder. I have 2k miles on mine now. And I love it.
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