Today I was driving down the road and everything was fine. Turned and gave it some gas and about the time the turbo kicks in (2500RPM) I hear this loud squealing noise. It sounded like someone with a screw gun was under my hood. The car has no boost just that "Screwgun" like noise. A friend of mine thinks the bearings on it are bad. Any suggestions? Bearings? Or just a worn down turbo?