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As stated above, it's easier if you disconnect the mid-pipe from the muffler. I think it's possible to do it without unbolting the muffler, but why make it harder on yourself? And if you're using the stock exhaust, Nismo, or Fujitsubo exhaust, there's no gasket between the muffler and the mid-pipe. It's an O-ring, which is made of rubber. And it does not need to be replaced.
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