I have a list of cosmetic things that need work on my X that I picked up 10 days ago. Also my brakes will produce a high-pitched squeal occasionally. However, one is more worrisome and wondering if anyone has experienced it. When my car accelerates normally to around 48-51 MPH, there's a grinding noise that appears to be coming from the passenger side back wheel. It lasts a few seconds if I stay in that speed range. I was able to reproduce consistently this morning and had been hearing for a while but thought it might just be something in the trunk. I did note that if the noise happened and then i slowed down to like 40 MPH and then accelerated through 50 MPH, then it wouldn't happen. It seems to be happening when going from low speeds to 50 MPH. It's hard to hear in this video with the background noise, but it starts as the car hits 49-50 mph.