GMC K2500 Headers

PACESETTER HEADERS, STEEL, BLACK, SET OF 2 -- Product legal for sale in California under Executive Order (EO) number D-439-7. Before purchasing this product, please check the Executive Order at www.arb.ca.gov to verify whether this product is allowed for installation on your specific vehicle application; 1.5 in. tube diameter, 16-gauge tube wall thickness, 2.5 in. flange collector, 0.38 in. standard head flange; Mounting hardware, illustrated instructions, and header extension included to connect to stock system; 4-1 design; Round head port; Easy-to-clean; Features mandrel-bent mild steel primary tubing that is black-painted to reduce under hood temperature and to resist rust and corrosion; Significantly boosts performance and increase engine efficiency; Hook-ups for smog and engine management sensors; Fabrication may be required; Replaces stock exhaust manifold; Bolts to stock down pipe; Retains catalytic converter in stock location; Pre-catalyst vehicles must use original emission control devices; It is the responsibility of the customer to reinstall these devices on the vehicle.

Fits the following 1996-1999 GMC K2500 submodels:

• 1996-1999: Sierra SL; 8 Cyl 5.7L; "GAS, FI, Naturally Aspirated, VIN R"
• 1996-1999: Sierra SLE; 8 Cyl 5.7L; "GAS, FI, Naturally Aspirated, VIN R"

• 1996-1999: Sierra SLT; 8 Cyl 5.7L; "GAS, FI, Naturally Aspirated, VIN R"

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GIBSON PERFORMANCE HEADERS, 409L STAINLESS STEEL, NATURAL FINISH, SET OF 2 -- 49-state legal; Not for sale or use in California; Cannot be shipped to California addresses; 1.5 in. tube diameter, 16-gauge tube wall thickness, stock flange connector, 0.375 in. standard head flange; Premium gasket and installation hardware included; Shorty style; Round head port; Direct fit bolt-on replacement for factory exhaust manifold; Made of high quality 409L stainless steel mandrel-bent tubing to maintain constant exhaust flow for outstanding performance; They feature heavy duty 0.375 in. thick laser cut port flanges and OEM style connections; They attach to OE crossover pipe; Dyno-tuned and engineered to deliver more usable horsepower and torque; These headers increase the engine's efficiency by allowing it to breathe easier and run at cooler temperature; Well suited for lowered and raised vehicles, street, and off-road; Dyno tested to perform best with Gibson's cat-back exhaust system; For vehicles with EGR fitting; For vehicles without air injection.

Fits the following 1998-1998 GMC K2500 submodels:

• 1998-1998: Sierra SL; 8 Cyl 5.0L;
• 1998-1998: Sierra SLE; 8 Cyl 5.0L;

• 1998-1998: Sierra SLT; 8 Cyl 5.0L;

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JBA CAT4WARD SHORTY HEADERS, STAINLESS STEEL, SILVER CERAMIC, SET OF 2 -- 49-state legal; Not for sale or use in California; Cannot be shipped to California addresses; 1.5 in. tube diameter, 0.375 in. standard head flange; Shorty style; Round head port; They include mandrel-bent stainless steel primary tubes, patented JBA Firecone collector, factory style emission connections, extra thick collector domes, CNC laser-cut flange, and oversized exhaust ports; Made of tough and durable stainless steel; Constructed through race-proven technology for maximum horsepower and torque gains; They improve throttle response, resist warping, prevent leakage, increase flow, and accommodate cylinder head porting; Direct replacement for factory manifold, installation hardware kit included; For vehicles with air injection; Easy installation.

Fits the following 1998-2000 GMC K2500 submodels:

• 1998-2000: Sierra SL; 8 Cyl 5.7L;
• 1998-2000: Sierra SLE; 8 Cyl 5.7L;

• 1998-2000: Sierra SLT; 8 Cyl 5.7L;

• 1998-1998: Sierra SL; 8 Cyl 5.0L;

• 1998-1998: Sierra SLE; 8 Cyl 5.0L;

• 1998-1998: Sierra SLT; 8 Cyl 5.0L;

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HEDMAN STANDARD DUTY EXHAUST HEADERS, BLACK-PAINTED -- 49-state legal; Not for sale or use in California; Cannot be shipped to California addresses; 1.625 in. tube diameter, 18-gauge tube wall thickness, 3 in. flange collector, 0.25 in. standard head flange; Premium gasket and installation hardware included; Without smog injection or injection heads; Full-length style; Round head port; They feature 18-gauge mandrel-bent primary tubes; Protected by factory applied black paint for pre-installation protection; Made in USA; Modification to stock exhaust required to retain catalytic converter; Must modify rotary A/C bracket; Elite replacement gasket part number 27520; Modification to clutch linkage may be needed; Late model chassis; Engine offset to passenger side of vehicle.

Fits the following 1988-1995 GMC K2500 submodels:

• 1994-1995: Sierra SL; 8 Cyl 5.0L;
• 1994-1995: Sierra SL; 8 Cyl 5.7L;

• 1994-1995: Sierra SLT; 8 Cyl 5.0L;

• 1994-1995: Sierra SLT; 8 Cyl 5.7L;

• 1988-1995: Sierra SLE; 8 Cyl 5.0L;

• 1988-1995: Sierra SLE; 8 Cyl 5.7L;

• 1988-1993: Sierra SLX; 8 Cyl 5.0L;

• 1988-1993: Sierra SLX; 8 Cyl 5.7L;

• 1988-1993: Sierra; 8 Cyl 5.0L;

• 1988-1993: Sierra; 8 Cyl 5.7L;

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FLOWTECH I STANDARD FULL-LENGTH HEADERS, SATIN BLACK HI-TEMPERATURE PAINTED -- 49-state legal; Not for sale or use in California; Cannot be shipped to California addresses; 1.625 in. tube diameter, 16-gauge tube wall thickness, 3 in. weld-on collector, standard head flange; All mounting hardware such as bolts, nuts, and premium gasket are included; Full-length style; Round head port; These headers are precision-engineered and leak-tested to provide the maximum performance and fuel efficiency of your engine; Formed from specially selected 0.060 cold roll flash controlled tubing with high quality electrostatically-applied satin black paint finish; They feature Flowtech's exclusive, thick, and mandrel-formed power plenum collector; All ports are precisely fitted and finished with sturdy and leaf-proof o-ringed port seals; Must modify stock exhaust to retain catalytic converters; Applications with oxygen sensor use reducer part number 10105 for 2.5 in. 3-bolt flange or part number 10110 for 3 in. 3-bolt flange; Will not fit angle plug heads; Fits with OE factory equipped style transmission only; Catalytic converter compatible y-pipe available separately.

Fits the following 1988-1995 GMC K2500 submodels:

• 1994-1995: Sierra SL; 8 Cyl 5.0L;
• 1994-1995: Sierra SL; 8 Cyl 5.7L;

• 1994-1995: Sierra SLT; 8 Cyl 5.0L;

• 1994-1995: Sierra SLT; 8 Cyl 5.7L;

• 1988-1995: Sierra SLE; 8 Cyl 5.0L;

• 1988-1995: Sierra SLE; 8 Cyl 5.7L;

• 1988-1993: Sierra SLX; 8 Cyl 5.0L;

• 1988-1993: Sierra SLX; 8 Cyl 5.7L;

• 1988-1993: Sierra; 8 Cyl 5.0L;

• 1988-1993: Sierra; 8 Cyl 5.7L;

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PATRIOT SPECIFIC FIT HEADERS, METALLIC CERAMIC-COATED, SET OF 2 -- 49-state legal; Not for sale or use in California; Cannot be shipped to California addresses; 1.625 in. tube diameter, 3 in. collector; Includes gaskets, hardware, collector reducers, and installation instructions; Full-length style; Oval port shape; Features ceramic coated tubing that is corrosion and rust resistant; Lowers under hood temperatures for more power and extended product life; Easy to maintain; It has thick machined flanges for great seal; Its high flow mandrel-bent mild steel tubing provides greater horsepower and torque; Fits D-port cylinder heads including ZZ4 crate engines; Will fit most angle plug heads; Non-catalytic converter equipped; Reducers available with oxygen sensor fitting; Installation requires left side A/C bracket part number H7608; 1979 and later vehicles with short compressors can use the stock bracket.

Fits the following 1979-1986 GMC K2500 submodels:

• 1982-1986: Base; 8 Cyl 6.2L;
• 1982-1986: High Sierra; 8 Cyl 6.2L;

• 1982-1986: Sierra Classic; 8 Cyl 6.2L;

• 1979-1986: Base; 6 Cyl 4.8L;

• 1979-1986: Base; 8 Cyl 5.7L;

• 1979-1986: High Sierra; 6 Cyl 4.8L;

• 1979-1986: High Sierra; 8 Cyl 5.7L;

• 1979-1986: Sierra Classic; 6 Cyl 4.8L;

• 1979-1986: Sierra Classic; 8 Cyl 5.7L;

• 1985-1985: Base; 6 Cyl 4.3L;

• 1985-1985: High Sierra; 6 Cyl 4.3L;

• 1985-1985: Sierra Classic; 6 Cyl 4.3L;

• 1982-1982: Sierra Grande; 8 Cyl 6.2L;

• 1979-1982: Sierra Grande; 6 Cyl 4.8L;

• 1979-1982: Sierra Grande; 8 Cyl 5.7L;

• 1980-1980: Base; 6 Cyl 4.1L;

• 1980-1980: High Sierra; 6 Cyl 4.1L;

• 1980-1980: Sierra Classic; 6 Cyl 4.1L;

• 1980-1980: Sierra Grande; 6 Cyl 4.1L;

• 1979-1980: Base; 8 Cyl 6.6L;

• 1979-1980: High Sierra; 8 Cyl 6.6L;

• 1979-1980: Sierra Classic; 8 Cyl 6.6L;

• 1979-1980: Sierra Grande; 8 Cyl 6.6L;

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HOOKER COMPETITION FULL-LENGTH HEADERS, BLACK HI-TEMPERATURE PAINT -- 1.625 in. tube diameter, 16-gauge tube wall thickness, 2.5 in. flange collector, 8 in. collector length, 0.3125 in. standard head flange; They include all the necessary hardware for complete installation; Sap shape port; Full-length style; They feature tuned-length primary tubes for maximum exhaust scavenging and velocity, light but sturdy 16-gauge mild steel mandrel-bent tubing for smooth exhaust flow, long transition collector for decreased back pressure, and machined flanges for a perfect seal; Designed for optimal performance and industry's best welds for durability; Exhaust systems can also be fabricated using either Hooker Super Competition Aero Chamber mufflers, Maximum Flow mufflers, Super Competition turbo mufflers, Competition turbo mufflers or header type Hooker mufflers; Equipped with a fitting to accept the stock oxygen sensor; With Hooker's limited warranty.

Fits the following 1988-1995 GMC K2500 submodels:

• 1994-1995: Sierra SL; 8 Cyl 5.0L;
• 1994-1995: Sierra SL; 8 Cyl 5.7L;

• 1994-1995: Sierra SLT; 8 Cyl 5.0L;

• 1994-1995: Sierra SLT; 8 Cyl 5.7L;

• 1988-1995: Sierra SLE; 8 Cyl 5.0L;

• 1988-1995: Sierra SLE; 8 Cyl 5.7L;

• 1988-1993: Sierra SLX; 8 Cyl 5.0L;

• 1988-1993: Sierra SLX; 8 Cyl 5.7L;

• 1988-1993: Sierra; 8 Cyl 5.0L;

• 1988-1993: Sierra; 8 Cyl 5.7L;

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