Installation Procedure

Using a wire brush, clean the contact area of the left and right mufflers to the intermediate pipe.
WARNING: Refer to Protective Goggles and Glove Warning .

NOTE: If reinstalling the original intermediate pipe, the tail pipe/muffler band clips must be replaced. Mark the position of the band clips on the intermediate exhaust pipe. Remove the band clips by grinding the welds. Install new band clips on the intermediate pipe. Position the new band clips using the alignment mark created previously.
Apply a small amount of lubricant on the intermediate pipes and the left and right mufflers
Position the intermediate pipe on the jack stand and raise into position fitting the intermediate pipe to the mufflers.
Install the NEW exhaust pipe seals.
Install the intermediate pipe-to-catalytic converter pipe fasteners (1).

Fig 1: Intermediate Pipe-To-Catalytic Converter Pipe Fasteners And Exhaust Pipe Seals
Courtesy of GENERAL MOTORS COMPANY

NOTE: When installing the intermediate pipe-to-catalytic converter pipe fasteners, hand tighten only to allow for proper alignment of the exhaust system prior to the final assembly.
Install the fasteners (1) securing the intermediate pipe hanger bracket assembly (2) to the vehicle and tighten to 22 N.m (16 lb ft).

Fig 2: Fasteners And Intermediate Pipe Hanger
Courtesy of GENERAL MOTORS COMPANY

CAUTION: Refer to Fastener Caution .
Remove the adjustable jack stand.
Tighten the exhaust pipe/muffler clamps (1) to 44 N.m (32 lb ft).

Fig 3: Exhaust Pipe/Muffler Band Clamps
Courtesy of GENERAL MOTORS COMPANY
Tighten the intermediate pipe to catalytic converter fasteners (1) to 25 N.m (18 lb ft).

Fig 4: Intermediate Pipe-To-Catalytic Converter Pipe Fasteners And Exhaust Pipe Seals
Courtesy of GENERAL MOTORS COMPANY
Install the floor panel tunnel panel reinforcement. Refer to Floor Panel Tunnel Panel Reinforcement Replacement .
Lower the vehicle.