the MAP (Manifold Absolute Pressure) sensor versions have a small black box that is attached to the inlet manifold by a rubber pipe. (This pipe lets the sensor sample the inlet manifold air pressure) The MAP sensor usually sits on the firewall, and looks like this -
The AFM (air flow meter) sits between the throttle body and the air cleaner. The AFM is simply a sprung flap that swings back more and more as the engine sucks more air, thus making more power. looks like this -