Ferrari California Workshop Manual page 418

Fit the catalytic converter (B) in the relative seat,
then replace and fasten the clamp by
tightening the nut (3).
Tightening torque
Nut
Pre-tighten the nuts (2).
Tightening torque
Nut (pretightening)
Tighten the nuts (2).
Tightening torque
Nut
Undo the nuts (2).
Re-tighten the nuts (2) fastening the catalytic
converter (B) to the exhaust manifold.
Tightening torque
Nut
Nm Class
25 Nm B
Nm Class
15 Nm 0
Nm Class
25 Nm B
Nm Class
25 Nm B