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      10-06-2020, 05:04 PM   #12
///Motivated
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Drives: 335i, i3
Join Date: Jun 2017
Location: San Antonio, TX

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Quote:
Originally Posted by kyleb350 View Post
Preproduction maybe? I'm not an exhaust expert, but I imagine having the primary cats far from the manifold isn't good for efficiency.
The distance does nothing to efficiency. It just adds time, and therefore emissions, to the cold start. Once at operating temp in a few seconds the efficiency will be the same.
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