Curious if someone can provide an opinion here. My '10 has just 13K miles on the clock, and I've experienced the following exactly twice: both times when the car was in S5 shift mode and with DSC turned off (which I've done just twice); drive it pretty darned softly otherwise:
When launching the car twice under hard acceleration, and driving on concrete road surfaces with slight surface imperfections (vs. most asphalt roads), the car will make a metallic clanking sound as it hits a slight imperfection/tiny bump in the road, and I *think* the rear wheels spin momentarily. Sounds like hollow metal poles clanking together; being dropped on the ground. Only lasts a brief sub-second, and then disappears once I stop accelerating, but it's fairly loud. It sounds like it's coming from the rear of the car (or perhaps middle, but definitely not the front).
From what I've gathered from a brief search, I've seen some describe it as (a) guibo, (b) CSB, (c) driveshaft, (d) exhaust mounts, (e) motor or transmission mounts and (f) VANOS - don't think it's the latter; had a Z4MC with a VANOS issue and it sounded nothing like this.
Of course I have plenty of warranty left so will have the dealer take a look. But would appreciate any/all thoughts. Also, I have no earthly idea what a guibo or CSB is - so clarification would be appreciated!
P.S. It's not the same very quiet metallic clinking Cicada posted a vid about - that appears to happen on slow accel or coming to a stop. Only happens under hard accel with DSC off, and is far more noticeable; wouldn't need to wind down the windows to hear this one!