GIBSON 21-22 GMC Split Rear Exhaust System Instruction Manual
- June 13, 2024
- Gibson
Table of Contents
GIBSON 21-22 GMC Split Rear Exhaust System
Product Information
| Item | Part Number | Quantity | Description |
|---|---|---|---|
| A | 999701108S | 1 | Head Pipe |
| B | 420887-V | 1 | SFT Muffler |
| C | 999701094S | 1 | 3.0 Over Axle Y-pipe |
| D | 999701094S-B | 1 | 2.50 Passenger side Extension pipe w hanger |
| E | 999701094S-C | 1 | 2.50 Driver side Extension pipe w hanger |
| F | 999701109S | 1 | 2.5 Stainless Exit pipe Notched (Driver Side) |
| G | 999701110S | 1 | 2.5 Stainless Exit pipe Notched (Passenger Side) |
| H | 5762 | 4 | 2.5 band clamp |
| I | 5763 | 2 | 3.0 band clamp |
| J | 500662-B | 2 | Rolled Round Angle Cut Tip |
| K | 4240 | 1 | Rubber Grommet (Not used on all applications) |
Product Usage Instructions
Thank you for purchasing our GIBSON EXHAUST SYSTEM for your Vehicle. If you need further assistance, please do not hesitate to call our Technical Department at 800-528-3044, Monday through Friday, 8:00 am to 5:00 pm PST.
CAREFULLY READ INSTRUCTIONS BEFORE INSTALLING PRODUCT
When installing this exhaust system make sure to use proper safety precautions. Therefore, make sure instructions are thoroughly read and understood before attempting to install. Use jack stands when working under the vehicle, set parking brake, block tires and use safety glasses and gloves. Allow exhaust system to cool before attempting installation. Severe injury or burns could occur if safety measures are not taken.
SUGGESTED TOOLS: Sawzall or hack-saw, 1/2, 9/16 socket or wrench, 15mm deep socket or wrench. Hanger removal tool or large channel-lock pliers, WD-40 and Jack Stands.
TO REMOVE YOUR STOCK EXHAUST: Unbolt the back half from the flange located above the rear suspension, then loosen the front clamp and remove the remaining exhaust. Your Spare Tire & Heat Shield will need to be removed for installation. (FACTORY RUBBER HANGER GROMMETS WILL BE REUSED, USE WD-40 TO AID IN REMOVAL.)
Installation Steps
- Install head pipe #A onto your existing stock pipe using your factory Band Clamp. Insert welded hanger into rubber grommet. Do not tighten.
- Install metal hangers #K using Bolt Kit #J. Reuse the middle support hanger grommet from the stock exhaust for this bracket.
- Install the Over Axle Assy. #C into the muffler at least 1-1/2 to 2 inches. #C needs to be installed from the back of the car where the Spare Tire Sits. Use clamp #H to secure pipe to the muffler. Do not tighten. Insert hangers into rubber grommet.
- Install the Over Axle (B) #D onto the Passenger Side (PS) output of the First Over Axle Pipe, then install Over Axle (C). Use clamps #G to secure the pipe. Do not tighten. Next, install the Exit Pipes #E with the tips pre-installed to set the height, then tighten using clamps #G.
- Install muffler onto head pipe #A 1-1/2 to 2 inches with the louvers facing towards the converter. Use a jack stand to support the muffler. Use clamp #H to secure the muffler to the head pipe. Do not tighten.
- Reinstall spare tire and heat shield. Position all pipes and double-check all connections prior to tightening clamps.
- Finally, go back and tighten all clamps, nuts, and bolts. Use stainless steel cleaner and a Scotch Brite pad weekly to prevent the tip from discoloration. Inspect all fasteners after 25-50 miles of operation and retighten as necessary.
PARTS
-
65715B
| Item | Part Number | Quantity | Description |
|---|---|---|---|
| A | 999701108S | 1 | 3″ Head Pipe |
| B | 420887-V | 1 | SFT Muffler |
| C | 999701094S | 1 | 3.0″ Over Axle Y- pipe |
| D | 999701094S-B | 1 | 2.50″ Passenger side Extension pipe w hanger |
| E | 999701094S-C | 1 | 2.50″ Driver side Extension pipe w hanger |
| F | 999701109S | 1 | 2.5″ Stainless Exit pipe Notched (Driver Side) |
| G | 999701110S | 1 | 2.5″ Stainless Exit pipe Notched (Passenger Side) |
| H | 5762 | 4 | 2.5″ band clamp |
| I | 5763 | 2 | 3.0″ band clamp |
| J | 500662-B | 2 | Rolled Round Angle Cut Tip |
| K | 4240 | 1 | Rubber Grommet “Not used on all applications” |
CAREFULLY READ INSTRUCTIONS BEFORE INSTALLING PRODUCT
- When installing this exhaust system make sure to use proper safety precautions.
- Therefore, make sure instructions are thoroughly read and understood before attempting to install.
- Use jack stands when working under the vehicle, set parking brake, block tires and use safety glasses and gloves.
- Allow exhaust system to cool before attempting installation.
- Severe injury or burns could occur if safety measures are not taken.
SUGGESTED TOOLS
- Sawzall or hack-saw, 1/2″, 9/16” socket or wrench, 15mm deep socket or wrench.
- Hanger removal tool or large channel-lock pliers, WD-40 and Jack Stands.
Installation Instructions
-
TO REMOVE YOUR STOCK EXHAUST, Un Bolt the back half from the flange LOCATED above the rear suspension, then loosen the front clamp and remove the remaining exhaust. Your Spare Tire & Heat Shield will need to be removed for installation. (FACTORY RUBBER HANGER GROMMETS WILL BE RE-USED, USE WD-40 TO AID IN REMOVAL.)
-
Install head pipe #A onto you’re existing stock Pipe use your factory Band Clamp. Insert welded hanger into rubber grommet. Do not tighten.
-
Install muffler onto head pipe #A 1-1/2” to 2” with the louvers facing towards the converter. Use a jack stand to support the muffler. Use clamp #H to the secure the muffler to the head pipe. Do not tighten.
-
Install metal hangers #K using Bolt Kit #J. We will Re-use the middle support hanger grommet from the stock exhaust for this bracket.
-
Install the Over Axle Assy. #C into the muffler at least 1-1/2” to 2”. #C needs to be installed from the back of the car where the Spare Tire Sits. Use clamp #H to secure pipe to the muffler. Do not tighten. Insert hangers into rubber grommet.
-
Install the Over Axle (B) #D onto the PS output of the First Over Axle Pipe then install Over Axle (C). Use clamps #G to secure pipe. Do not tighten.
Next, Install the Exit Pipes #E with the tips pre-installed to set height, then tighten using clamps #G.
Re install spare tire and heat shield. Position all pipes and double check all connections prior to tightening clamps. -
Finally, go back and tighten all clamps, nuts and bolts. Use stainless steel cleaner and a Scotch Brite pad weekly to prevent tip from discoloration.
Inspect all fasteners after 25-50 miles of operation and re-tighten as necessary.
GIBSON EXHAUST systems are designed on a factory stock vehicle. Any aftermarket products installed could increase the sound levels of this Exhaust. Make sure there is a 1” clearance from ALL rubber brake lines, shock boots, fuel lines, tires, etc to prevent heat related damage or fire.
Thank you for purchasing our GIBSON EXHAUST SYSTEM for your
Vehicle. If you need further assistance, please do not hesitate to call our
Technical Department at 800-528-3044,
Monday through Friday, 8:00 am to 5:00 pm PST.
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