Quote:
Originally Posted by 5genJordan
From my understanding and what I've been told is that rear o2's don't change anything with air and fuel ratio. That they are there just to make sure your cats are in place for emissions test. I had 2" long tubes with catless connectors installed on my 13 ls3 and never got a code until I had an issue with my motor that wasn't related to the headers. Obviously you don't get the maximum performance with out a tune but it did well.
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You are correct but codes are set by the front O2s in many cases due to being moved further from the engine.