Thread: Z4M cats
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      08-21-2015, 03:05 PM   #23
mpathic
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Drives: Z4 MCoupe,3.0Si R,E61 535xiT
Join Date: Oct 2014
Location: California

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Curious, since they sit downstream of the O2 sensors so aren't part of closed loop metering, how much are these cat vs resonators?
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