Gibson GP126S Stainless Performance Header for 5.4L Ford Super Duty/Excursion

Vehicle Fitment

• 1999-2005 Ford F-250 Super Duty (5.4L V8)
• 1999-2005 Ford F-350 Super Duty (5.4L V8)
• 2000-2005 Ford Excursion (5.4L V8)

Features

• Performance header designed to improve exhaust flow and engine breathing
• Mandrel-bent stainless steel tubing for durability and smoother airflow
• Heavy-duty 3/8" laser-cut port flanges to resist warping and leaks
• Shorty header style to fit stock crossover and chassis constraints
• Direct bolt-on installation with OEM style connections - no welding required
• Premium gaskets and hardware included for complete install
• Dyno-tuned design improves usable horsepower and torque at low/mid RPMs
• 50-state emissions legal (EPA & CARB compliant) for street use

Specifications

• Brand: Gibson Performance Exhaust
• Part Number: GP126S
• Type: Performance Header (shorty style)
• Material: 409 stainless steel, 16-gauge mandrel bent
• Primary Tubing: 1.50" diameter
• Port Flanges: 3/8" thick laser-cut stainless
• Fitment Location: Direct replacement for factory manifolds
• Emissions: EPA & CARB 50-state legal with EGR fitting

Included Components

• 1x Gibson GP126S stainless performance header assembly
• Premium exhaust gaskets
• Installation hardware (bolts/studs)

Product Description

The Gibson GP126S Performance Header is a direct-fit aftermarket engine header designed for Ford Super Duty trucks and Excursion SUVs equipped with the 5.4 L V8 engine. Engineered with mandrel-bent stainless steel tubing and heavy-duty laser-cut flanges, this header improves exhaust scavenging and engine breathing, which can translate to gains in low and mid-range torque and overall throttle responsiveness compared with the restrictive stock manifolds. Its shorty style is tailored to fit within the factory exhaust path, using the stock crossover pipe and OEM-style connections for a bolt-on installation that doesn't require welding.

Made in the USA and built with 16-gauge 409 stainless steel, the GP126S is engineered for long life and corrosion resistance on both street and off-road applications. The heavy-duty port flanges help reduce warping and leaks over time, while the included premium gaskets and hardware simplify the installation process. Designed to be 50-state emissions legal with EGR fitting, this header meets EPA and CARB requirements for use on public roads in all states.

Fitment is confirmed for 1999-2005 Ford F-250 and F-350 Super Duty models as well as 2000-2005 Ford Excursion SUVs, all powered by the 5.4 L V8 engine. Whether you're looking to improve throttle response, reduce exhaust restriction, or support further performance upgrades like a tune or cat-back exhaust, the Gibson GP126S offers a robust foundation for increased performance with everyday drivability.