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I did some research, and I found out that it's true, the Nissan ECU's DO attempt to correct for power mods, such as intakes. Check out this quote from someone who helped Technosquare develop the first ECU for the 2003 350Z:
More info about the infamous 'dialing back' of power...
the deal is that the stock ecu bases some of its fuel/air input through the oxygen sensors in the car. The computer will try to follow the pre-set map from the factory and uses feedback from the o2 sensors to do minor adjustments to the ignition/fuel mapping. So when you put on the new intake system the computer senses much more air flow than the stock mapping so, with this happening, the computer goes to the feedback value that's stored in the fuel/ignition timing maps to try to put it back stock levels. Which means the car is adding RETARDATION in the timing map. This takes away the ability for the engine to make more power with the additional air from the higher flowing intake.. so we're reducing that feedback value.