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Old 11-17-2008, 02:07 AM   #6 (permalink)
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I have heard that if one has two oxy. sensors that the single efie should be connected post-cat. Having two means that there is a reading before and after the catlist has done its job. I'm not quite sure why there would be two. Maybe it is to improve emisons. I'm working on a DUAL EFIE with higher grade conponents that are more sound under your bonet.
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