Installation Instructions
Cat-Back Extreme Dual Exhaust
Toyota Tundra 4.6L-5.7L
Crew Max, Short bed 5.5’ / Double Cab, Standard Bed 6.5’
Toyota Tundra 4.7L
Crew Max, Short Bed/ Double Cab, Standard Bed
Part #67501B

ITEM
A
B
CDEFGHIJKL
M
NPART
QUANTITY DESCRIPTION
1146-700905S
12.5” Stainless Passenger Side Headpipe
1147-700906S
12.5” Stainless Driver Side Headpipe
11240S
1Stainless Superflow CFT Muffler
1150-700909S
12.5” Stainless Passenger Side Extension Pipe1151-700910S
12.5” Stainless Driver Side Extension Pipe1154-700913S
12.5” Stainless Passenger Side Overaxle Pipe1155-700914S
12.5” Stainless Driver Side Overaxle Pipe552-700413S
22.5” Stainless Exit Pipe
500640-B
24” Black Ceramic Rolled Tip
5757
82.5” Clamp
4267
1Rear Tailpipe Hanger
4315
1
Bolt Kit for Tailpipe Hanger
4240
1
Rubber Grommet
1330-701093S
12.5 Stainless Adapter w/flange for 2009+ Models
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, 8am to 5 pm.

Installation Instructions
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.
SUGGESTED TOOLS: 1/2", 9/16", 15mm wrenches & sockets, WD-40, hacksaw, jack stands
1. Disconnect the negative battery cable before removal of OEM exhaust. This will allow the computer to reset and recognize thenew exhaust. Lay out the exhaust on the floor so it looks like the drawing and compare parts with manual.

2. Remove the stock exhaustat the 2-bolt flange located in
front of the muffler. Disengage
the welded hangers from theOEM rubber grommets. Use
WD-40 to help in the process.
Do not damage or remove therubber grommets as you willreuse them to mount your newsystem. Now, unbolt thetailpipe and remove exhaust.
Do not throw away stock
flange bolts, as you will reusethem.

6. Install the passenger sideoveraxle tailpipe #F to theextension pipe. Use clamp #J
to secure. Do not tighten.
Insert welded hanger into
rubber grommet.

3. Install passenger side
headpipe #A using your stockbolts. Do not tighten. Next,
install driver side headpipe #B(2009+ models use #K) usingstock bolts. Do not tighten.
Install metal hangers into
rubber grommets.

8. Install driver side overaxle
tailpipe #G onto extension
pipe, use clamp #J to securepipe. Do not tighten. Insert
welded hanger into rubbergrommet.

4. Install muffler #C ontoheadpipes 1.5”-2” with thelouvers facing towards theconverter. Use a jack stand tosupport the muffler. Useclamps #J to secure themuffler to the headpipes. Donot tighten. Muffler inlet islooking into the louvers.

9. Next, install the exit pipes#H. Use clamps #J to secure
the tailpipes.

5. Install extension pipe #D
into muffler. Use clamp #J tosecure. Do not tighten. Next
install driver side extension
pipe #E into muffler using
clamp #J to secure. Do nottighten. Insert welded hanger
into rubber grommet.

7. Install rear tailpipe hanger#K. Use bolt kit #L to secure.
Use the hole on frame closest
to the rear shackle. Installrubber grommet on rearhanger.

10. Install stainless steel tips.
Clamp down. When you haveeverything in place, firmly
tighten all bolts and clamps
down securely. Use stainlesssteel cleaner and a Scotch
Brite pad weekly to prevent tipfrom discoloration. Inspect all
fasteners after 25-50 miles ofoperation and re-tighten asnecessary.

GIBSON EXHAUST systems are designed on a factory stock vehicle
Any aftermarket products installed could increase the sound levels of the exhaust.
Make sure there is a 1” clearance from ALL rubber brake lines, shock boots, lines, tires, etc. to prevent heat related
damage or fire.