I recently stumbled upon some advanced helmet modification rules in one of the books, but I'm having a devil of a time trying to remember where exactly I saw it.
I could have sworn it was in War! or Spy Games, but I recall seeing rules for putting Dampers as an Audio Enhancement on a helmet somewhere. Does anyone know anything about this? (I'm aware of the basic armor modifications for Audio/Visual enhancements as listed on p.44 of Arsenal...)