Keep us posted... I had, what I think was the throw-out bearing making noise on me during one track event a few months ago. I was sitting in the pre-grid area with concrete walls on either side of me and could hear every little noise the car was making, bouncing off the walls... I distinctly heard the throw-out bearing rattling everytime I depressed the clutch and could feel the vibration in the stick...

It mysteriously disappeared after that...