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post #14 of (permalink) Old 08-12-2018, 05:50 AM Thread Starter
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Join Date: Sep 2012
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No. The O2 sensors are immediately pre and post the primary cats (which are integrated into the exhaust manifolds/headers). The 2nd cat (which is replaced by this pipe) has no effect on the O2 sensors as both are upstream of the 2nd cat.
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