Buy a 17MM gear wrench. It makes removal much easier. I reccomend pulling the 4 nuts that hold it to the exhaust manifold, the two clamps on the "accordian" and the two bolts that hold the flange that is between the accordian and down pipe, then just lift it out.

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine