I have a manual transmission, 2003 Toyota Rav4. The problem is that there is now a scratching sound, originating from the front center (sounds like it is right behind the front air vents), that starts at ~4k RPM and grows louder/faster as the RPM increases.
The problem is similar to the one described here: Drivetrain sounds like rustling leaves above 4k RPMs
The difference is that the noise occurs whether a gear is engaged or is in neutral. This is a link to a video with audio of the noise: Rav4 Video
Though different than the other StackExchange question, I wonder if the answer would be the same, a loose bearing or other.
Any thoughts or suggestions?