I have a small connection pipe/nipple thats not connected to anything, its on the black plastic box connected to the induction pipe not the air box (!) its under the main pipe on the filter side of the box.
I know the car had an induction kit on it before i bought it ,there are no unconnected pipes hanging free.
Don't know if this is connected but when lifting off ,aswell as the dumpvalve i hear a whistle type noise??
Its a 95 WRX.
Colin