The Hellcat makes a noise that sounds like its being caused by air flow. There's a video on you tube that has the noise.
Mine does this and I was hoping someone knows the solution. The noise comes from the driver side front.
Scares the Hell out of you when it occurs,
Speaking of fun noises.
My lower right engine under-tray piece was not, shall we say, well-attached. I did a high-speed run and was later rewarded by a big scraping sound as I drove. I got to a parking lot and found that somehow the tray piece had jammed down so it was dragging on the pavement. I folded it up, but it's getting replaced, haha. One of the mysteries you may uncover buying used. So far, buying a used Hellcat has been one of the top best decisions of my life. I not only bought it, but got it from across the country with only pictures and words from the dealer. No disappointments. It even seemed pretty well ceramic-coated, which was a nice bonus. Getting that re-done, also, after two years.
BTW, I don't necessarily advise putting hydrophobic coating on your windshield. When the wiper passes over, you want the water to be a very thin sheet, not a bunch of relatively tall drops, as the thin sheet rapidly evaporates, whereas the drops remain an annoying visual nag until the windshield is well and truly heated up by the defog warmth, which makes the water evaporate from the outside with greater eagerness far more affectively on a microscopically thin sheet of water than on droplets. A friend with a Tesla was wondering why his windshield and wipers, both brand new, do that annoying thing of leaving water behind so much, but I noticed his glass is hydrophobically coated.
A hydrophilic coating may be more appropriate.