Gibson GP126S 1-1/2in 16-Gauge 409L Stainless Performance Headers for Ford 1999-2005 (5.4L)

The Gibson GP126S Performance Header is engineered to deliver significant increases in usable horsepower and torque at the low and mid-range RPM bands, specifically tuned for towing, hauling, and highway performance. Designed as a direct bolt-on replacement for restrictive factory manifolds, these headers utilize the stock crossover pipe and OEM-style connections to ensure a straightforward installation without the need for welding.

Built for durability in demanding conditions, these headers are constructed from heavy-duty 16-gauge 409L stainless steel with mandrel-bent tubing for optimized exhaust flow and reduced engine temperatures. The 3/8-inch thick laser-cut port flanges provide a robust, warp-resistant sealing surface to prevent exhaust leaks. This system is 50-state street legal and meets all EPA and CARB requirements, maintaining factory warranty compliance.

• Fits 1999-2005 Ford F-250/F-350 Super Duty and Ford Excursion (5.4L)
• 1-1/2 inch 16-gauge 409L stainless steel mandrel-bent tubing
• 3/8 inch heavy-duty laser-cut port flanges for a leak-free seal
• Direct replacement for factory manifolds; no welding required
• Compatible with factory crossover pipe and OEM-style connections
• Includes premium gaskets and all necessary mounting hardware
• 50-State street legal; meets EPA and CARB requirements
• Manufacturer Part Number: GP126S