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For those referencing this thread, I wanted to mention that the N54 muffler not only has the holes in these two pipes in the center section, but it also has perforations in both pipes in the first y-section of the muffler, so this mod won't likely work as well. So, the N54 and N55 mufflers are different, and most of this thread is in reference to the N55 muffler. You'd have to cut open two chambers of the N54 muffler to get the same effect.
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