Thread: How loud does a cat less down pipe make your interior?
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      03-08-2021, 10:29 AM   #5
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Drives: 2011 335i E90
Join Date: Jan 2013
Location: Bay Area

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Originally Posted by Cloverdale View Post
No smell what so ever on my n54 and not noticeably louder.
No smell because n54s have secondary cats. Only the x-drive n55s have secondaries.
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