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Old 04-07-2013, 02:37 PM   #1
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Join Date: Aug 2009
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Location: Bolingbrook (and sometimes Hamilton,ont,Canada), IL
What I Drive: 09 Black SES MTX

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O2 sensor placement

Getting ready to put my FSW header in, and want to know exactly where to put the sensor for the wideband. I know the down stream gets deleted and the up stream goes into the bung on the header. I've seen people put them in one of the primaries, but that makes no sense to me because I think you'd want to measure combined exhaust gasses, not just a single cylinder.

I'm thinking to weld the bung into the flex pipe. Any suggestions?


HAVE: '09 SES MTX W/ FSWerks CAI, FSW 4-1 header, Crower Stg 1, 1.5" FRPP drop, Massive Toe arms, EBC slotted rotors + green pads.
WANTS: FSW Stealth exhaust, Tune, (possibly) Turbo
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