I just wanted to come back and say that the EAI cog/DuraAce ring combo with an Izumi V chain was nearly silent while racing last weekend. Given that those are typically noisy chains I'm impressed. They didn't feel any different, but the sound change was huge. Also, we can follow that with my old coworkers position that "Noise is energy that could be used better." and assume that a quieter drivetrain is more efficient. Or maybe all the Japanese stuff just works better together. I dunno.