If you hear any noise while your in neutral and not touching the clutch, any sort of rubbing or grinding. It might be imput-shaft bearing failure. I'm experienceing that now. Makes sounds in most gears, very loud if you floor it in first gear. Stops for a moment if you accelerate gently in 2nd and 3rd gears. If its anything like that, might be just Imput shaft bearing failure(which leads to other problems with the gears and synchros) if not, hopefuly just your throwout bearing. The throw out bearing would be my preference, cause its way easier to fix than Imput shaft anything. Sadly, I have to buy a new tranny, and its hard to find nice trannies off D16z6's or Y8's.