Headers - 03-06 GM Truck /Hummer 6.0L

The JBA Performance Exhaust Headers for 03-06 GM Truck/Hummer 6.0L LS-series engines deliver measurable gains in exhaust scavenging and engine efficiency. These stainless steel headers feature a 1.625-inch primary tube diameter merged into a 2.5-inch collector, a tuned configuration that optimizes exhaust velocity across the RPM band. Designed specifically for GM fullsize trucks and SUVs with the LS platform, this pair comes complete with gaskets and mounting hardware for a straight bolt-on installation.

The 1.625-inch primary diameter is engineered to maintain backpressure through mid-range RPMs while the stepped 2.5-inch collector transition reduces turbulence at the junction, allowing exhaust gases to flow more efficiently into your cat-forward or downstream exhaust system. Stainless steel construction resists corrosion and thermal cycling stress, critical for long-term durability on vehicles seeing regular use. The included gaskets and hardware eliminate guesswork during installation—everything needed for a proper seal is in the box.

These headers suit owners pursuing LS-series performance upgrades on 2003–2006 GM trucks and full-size sport utility vehicles. Whether running stock power or building toward a more aggressive tune, proper exhaust scavenging is foundational—headers reduce restriction at the cylinder head, supporting better breathing and more consistent timing across engine load. The natural stainless finish provides corrosion resistance without ceramic or powder coating, keeping weight minimal and maintaining structural integrity through heat cycles.

LS engine conversions and platform upgrades have made quality headers a core component for enthusiasts focused on extracting reliable performance. The JBA 1850S-3 delivers proven tube design and fitment accuracy for the third-generation Silverado, Suburban, and Hummer H2 market, integrating seamlessly with factory and aftermarket exhaust systems downstream.