Removing Catalytic Converter - Cylinder Bank 4-6

→ Let hot components cool down.

→ Wear personal protective gear.

Information 

Specifications for wrench sizes (a/f specifications) for screw heads are described as follows:

• Torx screws: (E..) for external Torx, (T..) for internal Torx. 
• Hexagon-head bolts (internal and external hexagon): Wrench size (a/f) 

1. Disconnect plug connections for electric lines for the oxygen sensors.
   1. 1.1. Unclip and release the oxygen sensor connectors (cylinder bank 4-- 6) -1 and 2-  in the engine compartment.
      Fig 1: Identifying Oxygen Sensor Connectors And Cylinder Bank (4-6)

      Courtesy of PORSCHE CARS NORTH AMERICA, INC.
   2. 1.2. Guide the oxygen sensor lines -1 and 2-  through at the side of the engine to the catalytic converter. To do this, unclip the cables from the holders -arrows-  .
      Fig 2: Locating Oxygen Sensors To Catalytic Converter

      Courtesy of PORSCHE CARS NORTH AMERICA, INC.
2. Loosen the rear silencer.
   1. 2.1. Loosen the clamp (M10 screw, a/f 15) -1-  at the connection point between the rear silencer and catalytic converter (cylinder bank 1-3).
   2. 2.2. Loosen two M8 cheese head bolts (hexagon socket head, a/f 6) -2-  for the restraining straps.
      Fig 3: Identifying Rear Silencer

      Courtesy of PORSCHE CARS NORTH AMERICA, INC.
   3. 2.3. Slide the restraining straps outwards over the holder -arrow-  .
      Fig 4: Sliding Restraining Straps Outwards Over Holder

      Courtesy of PORSCHE CARS NORTH AMERICA, INC.
3. Loosen four M8 fastening nuts (a/f 13) -1-  on the catalytic converter flange of the turbocharger on cylinder bank 4-6.
   1. 3.1. Threaded joint for catalytic converter flange at the top:
      Fig 5: Identifying Turbocharger Flange Nuts (Cylinder Bank 1-3)

      Courtesy of PORSCHE CARS NORTH AMERICA, INC.
   2. 3.2. Threaded joint for catalytic converter flange at the bottom:
      Fig 6: Identifying Turbocharger Flange Nuts At Bottom (Cylinder Bank 1-3)

      Courtesy of PORSCHE CARS NORTH AMERICA, INC.
   3. 3.3. Replace fastening nuts.
4. Pull the catalytic converter (cylinder bank 4-6) to the rear and off the studs on the turbocharger -arrow 1-  .
   1. 4.1. Then pull the rear silencer together with the catalytic converter off the catalytic converter on cylinder bank 1-- 3 -arrow 2-  .
   2. 4.2. Remove components with the help of another person. 
      Fig 7: Removing Rear Silencer/Catalytic Converter (Cylinder Bank 1-3)

      Courtesy of PORSCHE CARS NORTH AMERICA, INC.
5. Disconnect the removed catalytic converter (cylinder bank 4-6) from the rear silencer by loosening the clamp and pulling off the catalytic converter.