The tail-pipe style widebands used by tuners (at least, the ones I've known personally, Shiv at vishnu and Nate at S-Squared) are heated, just like OEM narrowband units. They are also calibrated for use in that spot- they'd read improperly if used in the downpipe. We could probably debate just how precise the readings from either method is, but since they read consistently, and so few professional tuners have issues with overly rich or lean tunes, it's probably safe to use that method.
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FWD is the new AWD
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