DIY installing N55 mid pipes on a N54...
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02-27-2013, 09:28 AM
Drives: '09 135i Crimson Red on Red
Join Date: Aug 2011
Location: Charlotte, NC
Great DIY, will this cause an O2 sensor error? I wouldn't think so since the O2 sensors are upstream of the secondary cats, but just want to make sure. Thanks!
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