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      02-27-2013, 09:28 AM   #50
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GrahamSP's Avatar
Drives: '09 135i Crimson Red on Red
Join Date: Aug 2011
Location: Charlotte, NC

Posts: 25
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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!