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I have a wideband O2 sensor on my 2.7 with CIS and SSI's; I use it to verify CIS is working right. I have the O2 sensor installed right behind the muffler flange. I've found that O2 sensor life isn't very long and I'm suspecting it's because the sensor is cold and not close enough.
If I was doing EFI, I'd install the O2 bung just downstream of where the three flow pipes come together.
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