No, what I mean is there's a special tiny speaker near noise to reduce the noise. Res box is to reduce the noise that come from the air to intake filter but does not reduce the noise that come from the engine. Noise reducer thing is to reduce the noise that coming out from the engine to the intake.
Let me see. Some of the headphones have those outside noise reducer, so you can hear the music more clear right? In Japan, some of automobiles (bus, trucks & etc) have noise reducer equip to reduce the noise.
Hope that explain it... BUT I'm not saying that's what that thing is, I'm just guessing. Recently Toyota have been tight on spec to leak out, I haven't got much info recentlt
