Exhaust System Removal:
For ease of installation and safety concerns, the use of a lift is recommended and be sure to wear safety glasses.
Prior to installation, be sure vehicle is parked on a level surface and the exhaust system is cool.
1) After your vehicle is properly secured and there is enough clearance to work from under the vehicle, the first step is to remove the oxygen sensor located between the catalytic converter and the center muffler – (See Fig. A). Use a 7/8-inch open-end wrench to remove the threaded sensor.
2) The next step is to determine where to cut the connecting pipe between the catalytic converter and center muffler. Using a tape measure, measure from the front edge of the catalytic converter flange (See Fig. C) back 20 INCHES for the STS or 18-1/2 INCHES for the DTS and mark the connecting pipe.
NOTE: Recheck your measurement
3) Using a saw or chain-style pipe cutter, cut the connecting pipe at the 20-inch or 18-1/2 inch mark depending on vehicle.
4) The next step is to remove each rear muffler from its hanger bracket. Use a 15mm socket wrench to remove the nut holding the top of the rubber insulator to the hanger bracket shaft.
NOTE: Be sure to keep the rubber insulator and nut from each rear muffler as they will be needed for the installation of your new mufflers.
5) Next, slide one of the rubber insulators off the Intermediate Pipe hanger bar.
6) Now the complete exhaust system can be removed as one piece. Once the system is removed, slide the rubber insulator off each muffler hanger

Exhaust System Installation:
1) Remove all new exhaust system parts from the shipping cartons including clamps. NOTE that there are six (6) 2 1/2-inch heavy duty TORCA clamps and one (1) 2 5/8-inch band clamp.
INSTALLATION NOTE: Be sure to apply the anti-seize lubricant that has been provided to all bolts, fasteners and clamps. A pouch with anti-seize lubricant is included with the hardware kit. Apply the supplied anti-seize lubricant to the threads ONLY of all TORCA band clamps. Failure to follow this procedure can cause the nuts to seize on clamps and potentially damage threads. WARNING:Be sure to thoroughly clean hands after use. Anti-seize lubricant will tarnish stainless steel parts.
2) Locate the round Center Muffler and the supplied 2 5/8-inch (One) band clamp. Slide the clamp over the “slotted”, or “expanded” end of the muffler and slide the muffler over the catalytic converter outlet. Snug fit the clamp – DO NOT TIGHTEN CLAMP – (See Fig. H) NOTE: Use file to remove any burrs from the factory connecting pipe.
3) Locate the Intermediate Pipe and slip a 2 1/2-inch TORCA clamp over the “slotted”, or “expanded” end of the pipe. Next, slip the “slotted” end of the pipe over the Center Muffler outlet – (See Fig. I) making sure the “hanger bar” that is welded on the Intermediate Pipe is facing down and snug fit the clamp – DO NOT TIGHTEN CLAMP.
4) Next, slide the Intermediate Pipe “hanger bar” into the rubber insulators still mounted to the frame hanger unit – (See Fig J & K).
5) Locate the “Y” Pipe and slip a 2 1/2-inch TORCA clamp over the “slotted” or “expanded” end (See Fig. L) and slide the end of the Intermediate Pipe into the “Y” Pipe (See Fig. M). Check to make sure the “Y” Pipe is level and snug fit the clamp – DO NOT TIGHTEN CLAMP.

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