I don't believe that part - the ones shown in the picture/videos are brushless motors, quite efficient (90%) and really silent on their right own. The noise co

I don't believe that part - the ones shown in the picture/videos are brushless motors, quite efficient (90%) and really silent on their right own. The noise comes from the need to move air (and the noise is just air waves), along with certain vibrations. A brushless motor is super silent if you exclude the fan(s) cooling it.