E46Fanatics - View Single Post - Dealing with Headers, Cats, O2 sensors, and Emissions
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Old 01-17-2013, 06:09 AM   #13
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Join Date: Mar 2005
Location: Columbia, MD
Posts: 756
My Ride: Many
Can you explain how the post-O2 sensor affects the tune please?
John V
'02 330Ci - Megasquirt 3 tuned by PFTuning.com
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