INSTRUCTION MANUAL
CAT-BACK SINGLE EXHAUST
TOYOTA TUNDRA 3.4L 2/4WD
TOYOTA TUNDRA 4.7L 2/4WD
Double Cab, Short Bed, Access Cab, Short Bed
PART #618602
ITEM PART # QTY DESCRIPTION
A 379-700250S 1 2 ½” STAINLESS HEADPIPE
B 788500S 1 SUPERFLOW STAINLESS MUFFLER
C 648-700503S 1 2-1/2”STAINLESS OVERAXLE TAILPIPE
D 378-700251S-B 1 2-1/2” STAINLESS EXIT TAILPIPE
E 500374 1 3-1/2" STAINLESS TIP
F 40095 1 O.E. HANGER/REAR MUFFLER
G 5757 2 2 ½" CLAMP
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
1-800-528-3044, Monday through Friday, 8:00 am to 5:00 PM
INSTALLATION INSTRUCTIONS
WHEN INSTALLING THE GIBSON EXHAUST SYSTEM, MAKE SURE TO USE PROPER SAFETY PRECAUTIONS. USE
JACKSTANDS WHEN UNDER THE VEHICLE, SET PARKING BRAKE,BLOCK THE TIRES,AND USE SAFETY GLASSES
AND GLOVES. DO NOT WORK WITH HOT PIPES!!
SUGGESTED TOOLS
9/16” SOCKET,12 MM SOCKET, ½” SOCKET,½” WRENCH, JACKSTANDS,HACKSAW, WD-40
LAY OUT THE GIBSON EXHAUST AND MATCH THE PIPE NUMBERS TO THE NUMBERS ON THE PARTS LIST MANUAL.
REMOVE STOCK EXHAUST
BY UN-CLAMPING THE
STOCK CLAMP AT THE
HEADPIPE. BE CAREFUL NOT
TO DAMAGE THIS CLAMP
BECAUSE YOU NEED TO REUSE IT. ONCE IT IS UNCLAMPED, YOU WILL BE
ABLE TO PULL THE STOCK
EXHAUST OFF THE
VEHICLE. MAKE SURE ALL
FACTORY RUBBER
GROMMETS ARE STILL IN
FACTORY LOCATION. USE
WD-40 TO AID YOU IN
REMOVAL OF THE HANGERS
FROM THE GROMMETS.
NEXT INSTALL REAR
MUFFLER HANGER #F
ONTO OUTLET OF
MUFFLER. INSERT
HANGERS INTO RUBBER
GROMMETS. DO NOT
TIGHTEN.
INSTALL THE GIBSON
HEADPIPE #A. MAKE SURE
THE HEADPIPE IS
STRAIGHT. YOU MAY WANT
TO GENTLY TAP THE END
OF THE HEADPIPE TO
ENSURE A TIGHT FIT.
CLAMP DOWN THE FACTORY
CLAMP AT THE FRONT OF
THE HEADPIPE. DO NOT
TIGHTEN.
SLIP OVERAXLE PIPE #C
INTO THE OUTLET OF THE
MUFFLER NO MORE THEN 2”
AND NO LESS THEN 1 ½”.
THE SPARE TIRE MAY NEED
TO BE LOSENED AND
PUSHED TO THE REAR OF
THE TRUCK TO GAIN
CLEARANCE FOR
INSTALLATION OF
OVERAXLE PIPE. INSERT
WELDED HANGER INTO
RUBBER GROMMET.
NEXT, SLIP THE MUFFLER
#B ONTO THE HEADPIPE
NO MORE THAN 2” AND NO
LESS THAN 1 ½”. ATTACH
TO HEADPIPE WITH CLAMP
#G.
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