Exhaust - NB Miata Torque Specs
Exhaust Header Pipe-To-Exhaust Manifold Nut
23-34 lb-ft
31-46 N-m
Exhaust Manifold-To-Head Bolt⁽¹⁾
28-34 lb-ft
38-46 N-m
Catalytic Converter Nuts (Both Ends)
30-41 lb-ft
40-55 N-m
O2 Sensor⁽²⁾
22-36 lb-ft
30-49 N-m
⁽¹⁾Tighten Evenly to Spec in Alternating Sequence.
⁽²⁾By Feel, as Close as Possible.
Sources: