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      08-09-2018, 01:32 PM   #31
maxio
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Drives: 2014 335i M Sport
Join Date: Apr 2017
Location: Dallas, TX

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It's not about the maker of the high-flow cats, it's about the concentration they're using.

From what I understand, OEM is 400 CEL, and if you stick with 300 CEL cats chances are you wouldn't throw a code.

Most makers use 200 CEL though, so make sure you check before you buy.
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