It sounds like you have the Zetec (four cylinder) engine. That extra box is just a resonator to make the airflow a little smoother and quieter. I think they may have left it out of some models (Mystiques?).
96 GL Zetec ATX, white with pinstripe, nickname " Sam Smooth " mods so far: CTA intake with homemade heat shield, KVR drilled front rotors & carbon pads w/ 500° fluid planned mods: exhaust (want to keep it quiet), e-ram (awaiting installation), diablo chip involuntary mods: compression increased after head gasket failure
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