bullet I think its the pilot bearing, its really the only thing in the tranny/clutch that could get messed up without messing up the shifting and engagement of the clutch. It will get louder over time too. Just wait

Teg_fan- I doubt the noise goes away as you go faster. I think you just can't hear it as you go faster. I can sometimes hear mine when I'm up close to a soundwall with the window down a bit