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Does it seem to make the noises while in neutral, at idle or while revving the engine? If it's bearings/etc you should really hear it at any time, since it's spinning constantly.
I had weird noise on my 98 before too... noticed boost gauge kept dropping under acceleration and tons of smoke when taking off from a stop. Turned out it was the hose from turbo to intercooler, clamp loosened off at the intercooler and was just spreading the hose apart at high psi's.
I'd recommend checking all your air/boost hoses and clamps and see if that gets you anywhere.
I had weird noise on my 98 before too... noticed boost gauge kept dropping under acceleration and tons of smoke when taking off from a stop. Turned out it was the hose from turbo to intercooler, clamp loosened off at the intercooler and was just spreading the hose apart at high psi's.
I'd recommend checking all your air/boost hoses and clamps and see if that gets you anywhere.