Unlock the full potential of your 2003–06 Chevy or GMC Truck 4.8L or 5.3L with premium long tube headers from Stainless Works. These headers feature 1-3/4" primaries that flow into 2-1/2" slip-fit collectors with O2 bungs welded into the collector that flow into 2-1/2" high-flow catalytic converters.
Designed specifically for the GMT800 platform, this system includes high-temp RTV silicone and an 8mm Header Bolt Kit for a complete bolt-on installation.
Built from corrosion-resistant 304 stainless steel and fully TIG welded for strength and durability at our state-of-the-art facility in Streetsboro, Ohio — engineered for long-term performance.
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American-made from raw material to finished product
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TIG welded by skilled craftsmen for strength and beauty
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Lifetime warranty on material and craftsmanship
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Direct bolt-on fit for 2003–06 Silverado/Sierra 4.8L & 5.3L
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Includes O2 bungs welded into collectors
| Vehicle Fitment | 2003–06 Chevy Silverado / GMC Sierra 4.8L & 5.3L |
| System Type | Long Tube Header Kit with High-Flow Cats |
| Primary Tube Size | 1-3/4" |
| Collector Size | 2-1/2" Slip-Fit with O2 Bungs |
| Catalytic Converters | 2-1/2" EPA Compliant High-Flow |
| Hardware Included | High-Temp RTV Silicone & 8mm Header Bolt Kit |
| Material | 304 Stainless Steel |
| Welding | TIG Welded |
| Warranty | Lifetime |
| Origin | Made in USA — Streetsboro, Ohio |
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Driver & Passenger Side Headers x2
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Lead Pipes x3
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Catalytic Converters
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Y-Pipe
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Exhaust Donut Gasket
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Clamps x6
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Long Bolts x2
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Washers x4
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Nyloc Nuts x2
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Bolt Kit — 16 Pieces
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RTV Tube
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Installation Instructions
Questions? Call us at 800-878-3635 | Mon–Fri 7:30am–4:30pm EST
Built To Order in 4 Weeks — Free Shipping on Orders $50+
