Claimed to increase power: the ECU thinks the ambient air is hotter, so correction for MAF sensor is wrong, over-estimating air sucked into manifold and ECU squirts some extra fuel. But then doesn't the exhaust sensor get final say, and trim the air-fuel ration back? Unless you hack the ECU as well, seems pointless.
Depends on the ECU algorithm.... But if the MAF is being used short term while the O2 sensor is averaged over a longer term, that is what will happen.
Deliberately forcing your engine to run rich might get you more power but it's not going to make your catalytic converter very happy. And in many situations will not get you any more pwoer at all.
--scott
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