Warning: Refer to Exhaust Service Warning in the Preface section.

Caution: Refer to Exhaust System Inspection Caution in the Preface section.

Note: This procedure is only to be performed if the exhaust is incorrectly aligned or is not clear of all other components or chassis.

Note: Make sure all exhaust retaining nuts and bolts are loose before conducting this procedure.

Note: The L98 exhaust is pictured but flange bolts are in the same location on LY7.

Caution: Refer to Fastener Caution in the Preface section.




1. Initially tighten catalytic converter to exhaust manifold retaining nuts (1) to 20 N·m  (15 lb ft).
2. Tighten catalytic converter to exhaust manifold retaining nuts (1) to 45 N·m  (33 lb ft).
3. Tighten exhaust crossover pipe to catalytic converter retaining nuts (2) to 40 N·m  (30 lb ft).
4. Tighten muffler to exhaust crossover pipe retaining bolts (3) to 45 N·m  (33 lb ft).