Went and looked at an E92 today, everything seemed ok. Except I noticed a really loud whirring sound, which I think is from the rear. When I say loud, it was masking some of the engine and downshift noise. It sometimes sounds like its coming from the front or engine, but I am 90% sure its in the rear. When revving stationary, you cant hear it. It starts when you pick up speed near 30mph, and the noise gets faster and louder as the speed increases. The best way to describe it, is like a UFO flying saucer lol, and the faster you go the faster the whirring sound is. Its definitely rotary related, possible something from engine when rotating, but more than likely rear. I thought its maybe bearing related, or diff maybe? But when the steering wheel is locked it doesn't have that diff grinding noise Ive had on previous E92's. Anyone else had this or something similar?