Trying to locate a noise on an '07 BMW 335i. Twin turbo/DI N54 3.0L, 123K. I'd almost think it's some of the turbo piping come loose, but it doesn't fluctuate quite like I think the turbos should. Not directly related to engine, vehicle, or cooling fan speed, either - sounds like it's coming from toward the back of the engine. Car has decent power but seems to get gradually weaker above 2,500 RPM (I'd think the TT six should really be hauling tail about that time) and the limp mode light (symbol of an engine sliced in half) comes on when it gets up close to 4,000. No CEL. Ideas?
https://youtu.be/Nf7Kugf9CxQ
https://youtu.be/uwu1ZYcwTnM
https://youtu.be/Nf7Kugf9CxQ
https://youtu.be/uwu1ZYcwTnM
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