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How to Install Gibson 3.5 in. Single Aluminized Cat-Back Exhaust - Single Side Exit on your Sierra

Installation Time

2 hours

Tools Required
  • 1/2", 9/16", 15mm wrenches & sockets
  • WD-40
  • hacksaw
  • jack stands

When installing this exhaust system make sure to use proper safety precautions. Use jack stands when working under the vehicle, set parking brake, block tires and use safety glasses and gloves. Allow exhaust to cool before attempting installation. Severe injury or burns could occur if safety measures are not taken.      

1. Disconnect the negative battery cable before removal of OEM exhaust. This will allow the computer to reset and recognize the new exhaust. Lay out the exhaust on the floor so it looks like the drawing and compare parts with manual.      


2. Remove the stock exhaust by unbolting it at the clamp Disengage the welded hangers from the OEM rubber grommets. Use WD-40 to aid in this process. Do not damage stock nuts and bolts or remove the rubber grommets as you will re-use them to mount your new system. Now, cut off tailpipe and remove system. 


your existing stock flange and secure using the stock hardware. Do not tighten. Insert welded hanger into rubber grommet. 




4. Install muffler #B onto headpipe 1½”-2” with the louvers facing towards the converter. Muffler outlet will be at the 9 o’clock position. Use a jack stand to support the muffler. Use clamp #E to
secure the muffler to the
headpipe. Do not tighten.
Muffler inlet is looking into the
louvers.

5. Slide tailpipe #C into muffler 1½”-2” and secure with clamp #F. Do not tighten. Insert welded hangers into rubber grommets. 

8. Install stainless steel tip #D. Clamp down. When you have everything in place, firmly tighten all bolts and clamps down securely. Use stainless steel or aluminum cleaner to polish tips. Inspect all fasteners after 25-50 miles of operation and re-tighten as necessary. 

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