Owners manual

ManualsBrandsGibson Performance ManualsAutomotiveGP131S Performance Header

GP131S

8.1L STAINLESS HEADER

AUTOMATIC ONLY

NO AIR INJECTION, NO EGR

SILVERADO/SIERRA PICKUP 2/4WD

CHEVY AVALANCHE 2/4WD

SUBURBAN/TAHOE/YUKON/DENALI 2/4WD

GIBSON HEADERS ARE 50 STATE SMOG LEGAL

Thank you very much for purchasing our Gibson header

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 a.m. to 5:00 p.m. PST.

1270 WEBB CIRCLE CORONA, CA 92879

Summary of content (6 pages)

PAGE 1
GP131S 8.1L STAINLESS HEADER AUTOMATIC ONLY NO AIR INJECTION, NO EGR SILVERADO/SIERRA PICKUP 2/4WD CHEVY AVALANCHE 2/4WD SUBURBAN/TAHOE/YUKON/DENALI 2/4WD GIBSON HEADERS ARE 50 STATE SMOG LEGAL Thank you very much for purchasing our Gibson header 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 a.m. to 5:00 p.m. PST.
PAGE 2
WHEN THESE INSTRUCTIONS ARE FOLLOWED PRECISELY, YOU WILL FIND THE INSTALLATION OF YOUR EXHAUST SYSTEM TO BE RELITIVELY SIMPLE. WE CANNOT OVER EMPHASIZE THE IMPORTANCE OF ADHERING STRICTLY TO THIS PROVEN APPROACH, AS IT WILL VIRTUALLY ELIMINATE ANY DIFFICULTIES, WHICH YOU MIGHT OTHERWISE ENCOUNTER.
PAGE 3
SUGGESTED TOOLS 7/16” WRENCHES (VARIOUS LENGTHS) 7/16” SOCKETS (SHALLOW AND DEEP) ½” WRENCHES (VARIOUS LENGTHS) 9/16” SOCKETS (SHALLOW AND DEEP) 5/8” SPARK PLUG SOCKET 7/8” OPEN END WRENCH 15MM DEEP SOCKET 15MM BOX END WRENCH 31MM OPEN END WRENCH (A LINE WRENCH) 3”, 6”, AND 12” EXTENSIONS FOR SOCKETS SCREWDRIVERS AND/OR NUT DRIVERS (FOR HOSE CLAMPS) SAWZALL (HAND –HELD POWER HACK SAW) LUG NUT WRENCH HIGH TEMP SILICONE (ULTRA COPPER BY PERMATEX) GOOD RUST PENETRANT
PAGE 4
INSTALLATION INSTRUCTIONS FOR HEADERS NOTE: Installation of these headers requires an adequate workspace, general mechanic’s tools, general mechanical “know-how” and a few special tools. However, you should carefully read these instructions before attempting to install headers. If in doubt, consult a professional mechanic. 1. Place vehicle in a location where the floor is solid and flat, with adequate lighting. Do not attempt to work on a hot engine.
PAGE 5
6. Prepare the header bolts by applying anti-seize to the threads. We supplied you with all new header bolts and star washers! Tighten all bolts from the center out, tighten header bolts to approx. 30-35 ft.lbs. Now install dipstick tube and spark plugs. Re-install EGR hose and spark plug wires. Re-connect Y-pipe to driver and passenger side Gibson headers using supplied hardware. 7. On suburbans there is an extra set of coolant lines passing by the headers on the passenger side.
PAGE 6
IT IS CRITICAL THAT ALL BOLTS BE RE-TIGHTENED HOT AFTER ABOUT 20 MINUTES OF OPERATION TO PREVENT GASKET FAILURE. NOTE: HEADERS ARE NOT MEANT TO SERVE AS “EXHAUST SYSTEM SUPPORT HANGERS”. ADDITIONAL HANGERS MAY NEED TO BE ADDED AT THE TIME OF THE INSTALLATION OF THE HEADERS SO THAT THE EXHAUST SYSTEM SUPPORTS ITSELF WHEN THE COLLECTOR BOKTS ARE REMOVED. HEADERS THAT HAVE “SAGGED” DUE TO THE LACK OF SUFFICIENT EXHAUST SYSTEM SUPPORT WILL NOT BE REPLACED UNDER WARRANTY.