I would put the O2 sensors where they were intended to go and not worry about drilling out the smaller holes. Were you just thinking of moving the O2 sensor further back hoping to not get any CEL? I don't think a few inches will make a difference.
If CEL comes on repeated due to the O2 sensors, AND if you plan on getting a dyno tune done after all your breather mods are in place, they can omit those sensors in the tune.
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2012 GT-R Black Edition Jet Black
2010 370Z 40th Anniversary // SOLD
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