Exhaust System Alignment

WARNING: This page is about a different car, the 2023 GMC Sierra 3500 HD and 2023 GMC Sierra 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

WARNING:

In order to avoid being burned, do not service the exhaust system while it is still hot. Service the system when it is cool.

WARNING:

Avoid contact with HOT components. Wear safety glasses and protective gloves to avoid personal injury.

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NOTE:
Left side shown, right side similar.

Front Wheelhouse Liner-Right Side (3) - Remove - Front Wheelhouse Liner Replacement
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Catalytic Converter Heat Shield Bolt (1) - Remove [3x]
Exhaust Pipe Heat Shield-Right Side (2) - Remove
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Exhaust Front Pipe Nut (1) - Remove [2x]
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Loosen the 2 catalytic converter brace bracket bolts (1) at the lower exhaust front bracket 1/4 turn each.
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NOTE:
If the stud plate assembly cannot be removed, further loosen the lower exhaust front bracket to flywheel housing bolts, remove the stud plate assembly, then hand tighten the bolts and reverse 1/4 turn.

Exhaust Front Pipe Stud Plate Assembly (1) - Remove
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Exhaust Front Pipe Nut (1) - Loosen
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Catalytic Converter Brace Bracket Bolt (1) @Exhaust Front Bracket- Upper - Loosen [4x]
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Loosen the exhaust pipe clamp (1) approximately 3.5 turns or just enough to allow the exhaust front pipe to rotate.
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Loosen the catalytic converter clamp (1) approximately 3.5 turns or just enough to allow the oxidation catalytic converter to rotate.
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Adjust the alignment of the exhaust front pipe (1) to oxidation catalytic converter by rotating, raising or lowering the pipe until the holes of the lower flange align with the lower exhaust front bracket (2).
Use vise grips to clamp the lower exhaust front bracket to the exhaust front pipe flange.
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CAUTION:
Refer to Fastener Caution

Catalytic Converter Clamp (1) - Tighten - Fastener Specifications
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Catalytic Converter Clamp (1) - Tighten - Fastener Specifications
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Catalytic Converter Brace Bracket Bolt (1) - Tighten [2x] - Fastener Specifications
Remove the vise grips.
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Exhaust Front Pipe Nut (1) - Tighten - Fastener Specifications
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Install the exhaust front pipe stud plate assembly (1) through the lower exhaust front bracket and exhaust front pipe flange holes.
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Catalytic Converter Brace Bracket Bolt (1) @Exhaust Front Bracket- Upper - Tighten [4x] - Fastener Specifications
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Exhaust Front Pipe Nut (1) - Install and tighten [2x] - Fastener Specifications
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Exhaust Pipe Heat Shield (2) - Install
Catalytic Converter Heat Shield Bolt (1) - Install and tighten [3x] - Fastener Specifications
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Front Wheelhouse Liner-Right Side (3) - Install - Front Wheelhouse Liner Replacement