I recently installed the TBA Machine idler pulleys on my 2020 hellcat. I was surprised at how heavy and how much drag the stock idler pulleys had in them. (Shown in video) I realize that I will not be gaining 20hp or anything but it is hard to say that there will be no benefit to installing two bearings that seem to weigh about 1.5 pounds less than the factory pulleys and have much smoother and free spinning bearings in them. It already takes so much power to turn the Supercharger, freeing up some seems like a no brainer. What do you guys think? Have any of you installed these?