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You can place the o2 sensors around the secondary cat when the primary cat is removed with the stock header. From what I've been told this is enough to make the ecu think the primary cat is still there.
So you will need an o2 sensor bung with cap and an o2 extension wire. You have the bung welded into your front pipe after the secondary cat and place your after-cat sensor there. Your before cat sensor goes where you would normally put the after cat sensor. You plug up where you would normally put the before cat sensor.
I installed my catless uel header this past weekend and have yet to throw a cel. I will be doing this sensor relocation this weekend.
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