Problem was fixed under warranty, so this is not an advice thread. I’m just curious. At 2000 RPM, a noise would come from the back of my car, kind of a high pitched whirring. It was diagnosed as stemming from loose exhaust covers (or something or other like that–I left the invoice at my office so I can’t say exactly what it said). So something back there was loose, and under the right circumstances was producing a noise. That’s clear enough. But why would it produce the noise just when I was at the 2000 RPM mark?
It had nothing to do with speed or rate of acceleration. It was specifically correlated to RPMs.