lately my car has been making a rattle noise very loud and very nasty between 2900-3400 rpm especialy louder when im off the gas. now today I got home with my car (driving very nice nothing over 3500 rpm) and I get out and smell something so I pop the hood and my turbo unit is smoking from under the heat shield... No idea what this is but it dosent seem good... Anyone know the problem?! its a white smoke.