The earlier 1uzfe ecus, the later usdm 1fzfe ecu, and several other Toyota ecus have extended maps that are setup for more airflow (ie forced induction).
The beauty of a MAF over a MAP setup is that changes to to the engine VE are easily compensated for because actual air flow I'd being measured, instead of calculating airflow based on pressure/temp. And if the ecu is already mapped for more airflow adding more power can sometimes mean just bolting on new parts. With the UZJ100 adding bolt on modifications such as headers, exhaust, intake, intake manifold, throttle body can be done without messing with the ecu maps or tuning.