Couple more details - I have monitored and logged O2 sensor and MAF data while driving and all O2 sensor readings have been within spec. I don't know off the top of my head what spec is for the MAF, but I can at least say that the readings are consistent from one trip to the next, and that I remove and clean it and everything around it about 3-4 times a year because I'm running a K&N air filter.
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