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^^ are you sure about that? I have a redtop with a "redtop harness" and am currently using a "fat" black top o2 with a e5 ecu. I did nothing but take out my skinny o2 and put the fat o2 in. do you have a wideband to actually know if there is no difference? because as soon as i put the correct o2 in to match the e5 ecu my afr's were much different, no longer rich all the time, and maintained a stable 14.7 at cruise and 13.5 at idle. maybe your rich problems stem from else where.
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