Intermediate Pipe (Service Replacement): Installation

Position service intermediate pipe under vehicle.
Slide outlet end of intermediate pipe over remaining section of muffler inlet pipe.
Install new gasket at outlet of catalytic converter.
Install intermediate pipe to converter outlet using three fasteners.
Torque:

Intermediate Pipe-to-Converter Nuts: 25 N.m (19 ft-lbs)
Install rubber isolator to hanger rod on intermediate pipe.

Fig 1: Intermediate Pipe To Converter
Courtesy of GENERAL MOTORS CORP.

NOTE: Locate muffler clamp 25 mm (1.0 in.) (2) from the end of the intermediate pipe and position clamp with U-bolt facing away from fuel tank.

Fig 2: Muffler Clamp Location
Courtesy of GENERAL MOTORS CORP.
Install pipe clamp at outlet end of intermediate pipe.
Align muffler and intermediate pipe, then tighten clamp.
Torque:

Intermediate Pipe: 41 N.m (30 ft-lbs)

NOTE: Make sure that after installing the replacement exhaust sections that the system has not shifted rearward allowing contact between the hanger bracket screw (1) and the hanger block. This will cause noise; loosen the muffler strap and shift forward on muffler to eliminate contact - retighten.
Check exhaust system for alignment and clearance to heat shields.
Torque:

Muffler Strap around Muffler: 22 N.m (16 ft-lbs)

NOTE: Position the muffler to ensure that there is 19 mm (3/4 in.) of clearance between the muffler and muffler ramp. (2) If proper clearance can not be obtained, the intermediate pipe must be shortened.

Fig 3: Positioning Muffler
Courtesy of GENERAL MOTORS CORP.
Start engine and check for leaks.