The back of the turbo bolts to a cast iron flange (item 44 in image), before it gets to the flexible metal tube (about 3" to 4" in length).

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1980 300TD-T (82 Turbo and Trans) 159,000 Miles "Jackie-O"
1983 300SD 272,000 Miles "Aristotle"
1987 Jeep Wagoneer Limited - keeps the MB's off the ice and out of the snow
1994 BMW 530it