Removal Procedure

Front Wheelhouse Liner-Right Side - Remove - Front Wheelhouse Liner Replacement
Courtesy of GENERAL MOTORS COMPANY

Using a suitable tool remove the position 2 nitrogen oxides sensor (1) from the nitrogen oxides catalytic converter.
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Using a suitable tool remove the position 3 nitrogen oxides sensor (1) from the nitrogen oxides catalytic converter.
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Using a suitable tool remove the exhaust particulate sensor (1) from the nitrogen oxides catalytic converter.
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Exhaust Pipe Clamp (1) - Loosen
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Exhaust Front Pipe Nut (1) - Remove [ 2x ]
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Catalytic Converter Brace Bracket Nut (1) - Remove [ 2x ]
Wiring Harness Retainer (2) @ Catalytic Converter Brace Bracket (3) - Remove
Catalytic Converter Brace Bracket (3) - Remove
Courtesy of GENERAL MOTORS COMPANY

Exhaust Front Pipe Nut (1) - Remove [ 2x ]
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Nitrogen Oxides Catalytic Converter (1) - Remove
Exhaust System Front Gasket (2) - Remove and DISCARD
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Remove the wiring harness retainer (1) from the exhaust front bracket and position the wiring harness (2) aside.
Courtesy of GENERAL MOTORS COMPANY

Catalytic Converter Brace Bracket Bolt (1) - Remove [ 2x ]
Exhaust Front Bracket (2) - Remove