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Beg to differ , but removing the screen ( the restriction) allows a greater volume of air to be sucked past the measuring resistor grid , remember the greater volume of air you can cram into a cylinder coupled with matching fuel ratio, will give a greater explosion thus driving the piston down , thus giving more power!!!!
Ever tried to blow thru a flyscreen ??? Its a lot harder than without it. The MAF measures Air Flow in Cubic Feet/minute , (or the metric equivalent) . The aim of the game is to get more cu/ft min past the sensor so it signals the ECU to program more fuel to match.