So today I took the Hellcat out for a spin around town for the first time since I had the aluminum DS installed (other than the 7-8 mile drive home after the install). I turned the stereo off to do a little cruising and accelerating to see if I could hear or feel anything different. I noticed when I was cruising, 40, 50 or so mph, almost like on cruise control, that if/when I just ever so lightly rested my foot on the accelerator, almost barely picking up speed...literally just enough that I wasn't losing speed....I could hear what sounds like a little hum or whine. It's NOT the supercharger whine, as it doesn't sound like it's coming from the front. It actually sounds more like it's coming from behind me, and definitely from below. I hadn't really tested this before when the OEM driveshaft was in. You really need a keen ear to hear it, it's not overly loud and if you give the car any real throttle it's not there. It's literally just when cruising and you almost just rest your foot on the accelerator with a minute amount of pressure. Or if you have the stereo on even a low volume it drowns it out. But it's definitely there now. Again, maybe it was there stock too, I don't know. But I hear it now, so wanted to see if this was a result of going with an aluminum DS or it's there stock too and I never noticed it. Not a big deal if it is a result of the aluminum DS, as the pros outweigh that little con. So the question is, has anybody else noticed this?