That's great news about the HPPS, especially since I think my almost-2-year-old DDC is getting louder. (Of course, my PC's getting quieter, so I may be fooling myself...) Interestingly, BrianS just suggested the same mass loading in
my system's thread. Don't you have any motorcyle-racing ballast sitting around? I know there's a bunch of shifter-kart lead in my basement.