I narrowed down the list of reasons my 4.8 might be farting. It has a low, long groan/fart noise when turning, but only in the morning. Does it all through my 45 minute AM routine then behaves perfectly when I leave work.

i ruled out suspension (just about totally rebuilt anyway), wheels (same), and motor mounts before going to the Indy. They confirmed the above and eventually landed on a worn power steering pump. Haven't done any work yet and they seem a bit unsure so don't want to throw money at noises just yet.

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2010 E93 M3 - Le Mans Blue
2010 E70 X5M - Alpine White
2016 F15 40e - Imperial Blue