You may want to check your oil pump that feeds the turbo, chances are that is gone and not the turbo, my buddy and I had turbo nytros for 3 years and had the crappy electric fuel pump that was used as the oil pump for the turbo and in the 3 years we owned them we went thru 5 pumps between the 2 of us. When the pump would go it would pop the seals and let oil flow into the charge tube and burn it making it smoke.