Gibson GP304S Performance Header - Stainless Steel, Short Tube, Direct-Fit

The Gibson GP304S Performance Header is a stainless steel, short-tube exhaust header engineered to unlock more usable power from your engine. Dyno-tuned in-house by Gibson, this header is designed to replace restrictive factory cast-iron exhaust manifolds with free-flowing tubular construction, improving exhaust scavenging to boost horsepower and torque in the low-to-mid RPM range where you need it most on the street or highway.

Built from heavy-duty 409L stainless steel 16-gauge tubing with mandrel-bent runners, the GP304S maintains a smooth, consistent bore throughout each tube to minimize turbulence and maximize exhaust flow velocity. The 3/8-inch thick laser-cut port flanges provide a precision, leak-free seal that resists warping even through repeated heat cycles.

Key Features:

• Dyno-tuned short-tube design delivers increased horsepower and torque at low and mid-range RPM
• Heavy-duty 409L stainless steel 16-gauge mandrel-bent tubing for superior flow and durability
• 3/8" thick laser-cut port flanges — no warping, no leaking
• Direct-fit bolt-on replacement for factory exhaust manifolds — no welding required
• Uses OEM-style connections and attaches to the stock crossover pipe
• Compatible with lowered and raised vehicles; suited for street and light off-road use
• Premium gaskets and all installation hardware included
• 50-state street legal — meets EPA and CARB requirements
• Will not affect the factory powertrain warranty
• Made in the USA
• Backed by a Lifetime Limited Warranty against defects in materials and workmanship, including rust-through coverage on stainless steel

The GP304S installs using existing OEM mounting points and connection points, making it an accessible upgrade for enthusiasts of all skill levels. All necessary gaskets and hardware are included straight out of the box. As a 50-state legal product meeting EPA and CARB standards, it's a compliant performance upgrade for daily drivers and weekend builds alike.