without that piece you were talking about, could you post it? I don't like loud obnoxious squeaks, whistles, spits or sneezes. If I couldn't find a BOV that didn't make weird noises, I was thinking about upgrading my recirc valves. I hear some are using two supra recirc valves on 3000GTs and are working fine with upper HP. Don't know how they would work on a Z though.