99- GM P/U 4.8/5.3L S.S. Header

The Gibson Exhaust 99–GM P/U 4.8/5.3L stainless steel header is designed for pickup truck owners looking to enhance exhaust flow and engine responsiveness. This header replaces the restrictive factory manifold, allowing for improved performance in Gen III LS platform engines, whether equipped with a stock 4.8L or the popular 5.3L variant.

Constructed from high-quality stainless steel, this header is built to resist corrosion and thermal degradation, ensuring durability even under demanding conditions. Its stepped primary tube design optimizes exhaust scavenging across the RPM range, enhancing volumetric efficiency without necessitating ECU tuning. The mandrel-bent construction and precise port matching minimize turbulence and backpressure, leading to improved throttle response.

Ideal for truck builders upgrading from factory emissions equipment or transitioning to a performance exhaust system, this header pairs well with aftermarket cat-back exhausts, air intakes, and tuning packages for cumulative performance gains. Its compatibility with 1999 and later GM full-size pickups makes it a versatile choice for enthusiasts looking to maximize their vehicle's potential.