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Old 06-17-2016, 09:35 PM   #1
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Help with 02 sensors for header info please!

Hi, I recently purchased a obx header for my 2010 focus. I was wondering if anyone knows what to do with the 02 sensors? I'm going to put one into the header and should I buy a high flow cat with a location for the down stream sensor? Or should I put it further back past the cat? Not sure what works best for these cars. I need to pass emissions that's the only reason I'm running a cat. I appreciate any help.
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Old 06-17-2016, 09:59 PM   #2
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Two sensor system on yours?

If so you may be able to get away with the downstream after the CAT to pass OBD emissions testing. Visual check won't make it of course.
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Old 06-17-2016, 10:33 PM   #3
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I swapped back to the stock manifold for emissions day. Much easier then trying to get all that to spoof the test.
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Old 06-18-2016, 09:52 AM   #4
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You need to keep the front o2 in front of the CAT and as close to its stock location as you can

The rear o2 doesnt matter where you put it

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Old 06-21-2016, 12:18 AM   #5
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Thats correct.
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Old 06-23-2016, 07:59 PM   #6
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Thank you everyone for the responses. Right now I'm just waiting for the high flow cat to come in with the header wrap. After I'm done I'll get that tune from you Tom!
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