Haven't heard anything about it but I'm guessing that they were talking about the hose the comes off the intake plenum towards the throttle body. I think that one takes a reading as to exactly what kinda prssure there is in there, but I'm not sure. It obviously has something to do with the way the car runs since it won't run with it off.
Personally I don't know about putting a bead in there (which'd make the passage for air smaler since it forced the air through the hole in the center of the bead instead of just the hose)... I'd be worried about it being sucked in or out or something.