bad bearing, but which one??
 

just bought an 02 lancer oz from a friend. he replaced the clutch a while ago (2 years?) with an act stage 2, he claims he replaced the throwout bearing however it is one of my suspect bearings. I would estimate that the car has about 300 miles on it since the clutch was changed. the noise is distinct almost sounds like drilling through steel at a slow speed, it's a growl and not high pitched. I can hear it while in neutral with the clutch engaged (pedal out), but goes away when the clutch his disengaged (pedal pressed). I can also hear it when the car is in motion whether the clutch is engaged or not, unless both the trans is in neutral and the clutch is disengaged (pedal pushed in) while rolling. I have read and been told multiple things but have yet to receive a clear answer. my suspect bearings are, the throwout/release bearing(main suspect), the trans input shaft bearing, and the pilot bearing(doubtful). any help is appreciated.