a small turbo escort uses both mas and map

right,,,, a map based system,,, if nothing changes to effect the VE of the engine, and the ecu was calibrated correctly in the first place great system

advantage to map,, theres nothing restricing the intake volume, disadvantage, will no adjust for slight changes in VE without a re-calibration

right MAF systems,,, these actualy measure the airflow though the engine, so can alter for slight changes in VE as these will be measured changes,, but sadly we have a slight restriction in our inlet system