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      03-01-2020, 09:13 AM   #10
mcintoshf30
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Drives: 2014 F30 335xi
Join Date: Jul 2017
Location: Pennsylvania

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I think downpipe should be your first option; personally I'd just go catless since it seems like no CEL is ever guaranteed.. Then I'd go with a valved rear muffler such as Valvetronic; it allows you to be pretty much straight piped when open and then super quiet when closed. I even deleted my resonator and it still sounds pretty damn quiet when closed.
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