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OP you were talking about oiled engine air filters and alternate (rotofab) intakes a while back. What state of modification is your car in now?
P013C bank 2 sensor 2 slow response rich to lean?
Don't see how a bad downstream sensor alone would severely affect drivability. Sounds like there are more yet undiscovered problems. If the car doesn't like air, then suspect a fuel issue. But I could see a MAF taking a dump if it got filter oil on it.
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