Tightening Specifications For Exhaust Manifold With Catalytic Converter

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First fit screws on the cylinder head and tighten according to the specified tightening sequence -1 to 9- .
→ Tightening torque: 30 Nm (22 ft. lb.)

Fig 1: Exhaust Manifold With Catalytic Converter Screw Tightening Sequence
Courtesy of PORSCHE CARS NORTH AMERICA, INC.
1. 1.1. Then tighten new M8 lock nuts -1- on the three-hole flange.
  → Tightening torque: 23 Nm (17 ft. lb.)
  
  Fig 2: Identifying Three-Hole Flange Lock Nuts
  Courtesy of PORSCHE CARS NORTH AMERICA, INC.