alright well two days ago i was driving, and since the road was empty about a block away from my home, i decide to do a little spirited acceleration, well when i hit 4500 RPM i heard this loud Whining type sound, my friend said that it's probably my belts. so i check the belts, and the tensioner, the tensier was a bit loose, so i tightened it, but the whining sound is still there! and i did a search and i found some threads where it said that the whining sound could possibly be my turbo dying! is that true?!? also i have the wastegate shimmed by two washers. anyone know what it might be? what i should look at? any help is welcome! Thanks in advance!