did some research on the iA sc kit; the resistor is there to scale down the maf output (otherwise it would be outputting a meaningless max signal most of the time given the increased airflow from the sc). it is designed to work with a custom giac tune and larger injectors. link here:
Imagine Auto 2.5L Supercharger is Live! - Rennlist Discussion Forums
without the tune, and with the resistor in place, your engine will think it is getting less air than it really is and operate in a lean condition. not good, as the engine needs the fuel to keep things cool. get the tune, or get a wide band and piggy back - cost is about the same once you factor in tuning.