Removal Procedure

Raise and suitably support the vehicle with safety stands.
If equipped with a 8.1 L engine, remove the exhaust muffler nuts.

Fig 1: Removing Exhaust Muffler Nuts
Courtesy of GENERAL MOTORS CORP.
If equipped with a 6.5L engine, remove the U-bolt clamp.

Fig 2: Removing U-Bolt Clamp
Courtesy of GENERAL MOTORS CORP.
Remove the exhaust muffler hanger brackets from the exhaust hanger insulators.
With the aid of an assistant, slide the muffler rearward in order to remove the muffler from the catalytic converter.
Remove and discard the exhaust muffler gasket.

Fig 3: Removing Exhaust Muffler Hanger Brackets
Courtesy of GENERAL MOTORS CORP.