There is a little exhaust leak at the down tube. I don't think It would make such a terrible screaming sound. I did not replace the o-rings between the intake and the turbo, but I did inspect them. They where not cracked and seemed to fit tightly. I will take the air filter off and look for black streaks right now. Thanks for your help.

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1980 300TD with 1985 300TD Turbo motor and 240D 4 speed.