2003 GMC SIERRA 1500 HD Headers

Headers, Long Tube One-Piece, 1 5/8 in. Primaries, Round Port, 3 in. Collectors, 2 1/2 in. Reducers, Steel, Natural, Cadillac, Chevrolet, GMC, Pair

Part Number: HED-69720

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Today

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Headers, Cat4ward, Stainless Steel, Natural, Cadillac, Chevy, GMC, Hummer, SUV, Pickup, 6.0L, Pair

Part Number: JBA-1850S-3

4.77 out of 5 stars ( 13 )

Estimated Ship Date: Today

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Headers, Street, Shorty, Steel, Temporary Paint, Cadillac, Chevy, GMC, Hummer, Small Block LS, Pair

Part Number: HED-69690

4.56 out of 5 stars ( 34 )

Estimated Ship Date: Today

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Headers, Cat4ward, Stainless Steel, Silver Ceramic Coated, Chevy, Pickup, 6.0L, Pair

Part Number: JBA-1850S-3JS

4.79 out of 5 stars ( 14 )

Estimated Ship Date: Today

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Headers, Street, Shorty, Steel, Silver Ceramic Coated, Cadillac, Chevy, GMC, Hummer, Small Block LS, Pair

Part Number: HED-69696

3.89 out of 5 stars ( 9 )

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Headers, Shorty, Steel, Silver Ceramic Coated, Chevy, GMC, Pair

Part Number: BIG-31142FLT

4.5 out of 5 stars ( 12 )

Estimated Ship Date: Today

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Header Fasteners, Locking Header Bolts, Internal Allen/Hex Head, Stainless Steel, Chevy, Set of 12

Part Number: MRG-2235G

4.89 out of 5 stars ( 9 )

Estimated Ship Date: Today

Headers, Full-Length, Steel, Black Ceramic Coated, Cadillac, Chevrolet, GMC, Pair

Part Number: HED-69723

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Header Bolts, Hex Head, 8mm x 1.25 Thread Size, Steel, Black Oxide, 0.984 in. Underhead Length, Chevy, Small Block LS, Set of 12

Part Number: MRG-918G

4.75 out of 5 stars ( 4 )

Estimated Ship Date: Today

Headers, Shorty, Steel, Temporary non-high, Temperature Paint, Pair

Part Number: BIG-11143FLT

3.57 out of 5 stars ( 7 )

Estimated Ship Date: Feb 19, 2026 if ordered today

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Headers, Cat4ward, Stainless Steel, Titanium, Cadillac, Chevy, GMC, Hummer, SUV, Pickup, 6.0L, Pair

Part Number: JBA-1850S-3JT

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Estimated Ship Date: Feb 27, 2026 if ordered today

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Headers, Shorty, Steel, Temporary Black Paint, Chevy, GMC, Pair

Part Number: BIG-11142FLT

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Headers, Street, Shorty, Steel, Temporary Paint, Cadillac, Chevy, GMC, Small Block LS, Pair

Part Number: HED-69680

4.0 out of 5 stars ( 1 )

Estimated Ship Date: Apr 24, 2026 if ordered today

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Headers, Stainless, Natural Finish, 3/8 in. Flanges, 1.875 in. Primary Tubes, 3.00 in. Outlet, Cats, Chevy, GMC Truck, Long System, Pair

Part Number: AMH-S00355

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Estimated Ship Date: Apr 13, 2026 if ordered today

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Headers, Full-Length, Steel, Silver Ceramic Coated, Cadillac, Chevrolet, GMC, Pair

Part Number: HED-69726

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Today

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Headers, Shorty, Stainless Steel, Natural, Cadillac, Chevy, GMC, Hummer, SUV, Pickup, 6.0L, Pair

Part Number: GIB-GP500S

4.0 out of 5 stars ( 4 )

Estimated Ship Date: Mar 2, 2026 if ordered today

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Headers, Street, Shorty, Steel, Black Ceramic Coated, Cadillac, Chevy, GMC, Pair

Part Number: HED-69683

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Estimated Ship Date: Apr 24, 2026 if ordered today

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Headers, Stainless, Natural Finish, 3/8 in. Flanges, 1.750 in. Primary Tubes, 3.00 in. Outlet, Cats, Chevy, GMC Truck, Long System, Pair

Part Number: AMH-S00353

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Estimated Ship Date: Apr 13, 2026 if ordered today

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Headers, Street, Shorty, Steel, Black Ceramic Coated, Cadillac, Chevy, GMC, Hummer, Pair

Part Number: HED-69693

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Estimated Ship Date: Apr 9, 2026 if ordered today

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Headers, Street, Shorty, Steel, Silver Ceramic Coated, Cadillac, Chevy, GMC, Small Block LS, Pair

Part Number: HED-69686

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Estimated Ship Date: Apr 20, 2026 if ordered today

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Headers, Street, Shorty, Steel, Silver Ceramic Coated, Chevy, GMC, Cadillac, 4.8, 5.3, 6.0L, Pair

Part Number: HED-66681

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Estimated Ship Date: Apr 20, 2026 if ordered today

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Headers, Full Length, 304 Stainless Steel, Silver Ceramic Coated, Cadillac, Chevrolet, GMC, Gen III/IV LS, Pair

Part Number: HED-62736

5.0 out of 5 stars ( 1 )

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Headers, Street, Shorty, Steel, Black Ceramic Coated, Cadillac, Chevy, GMC, 4.8, 5.3, 6.0L, Pair

Part Number: HED-63681

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Estimated Ship Date: Apr 9, 2026 if ordered today

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Headers, Stainless, Natural Finish, 3/8 in. Flanges, 1.750 in. Primary Tubes, 3.00 in. Outlet, No Cats, Chevy, GMC Truck, Long System, Pair

Part Number: AMH-S00352

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Estimated Ship Date: Apr 13, 2026 if ordered today

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Headers, Stainless, Natural Finish, 3/8 in. Flanges, 1.875 in. Primary Tubes, 3.00 in. Outlet, No Cats, Chevy, GMC Truck, Long System, Pair

Part Number: AMH-S00354

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