Gibson 05-06 Chevrolet Avalanche 2500 LS 8.1L 1-3/4in 16 Gauge Performance Header - Stainless

This is a Gibson 1-3/4 inch, 16-gauge stainless steel performance header, part number GP134S. It's designed to fit a range of heavy-duty trucks and SUVs, including models like the 2004-2006 Chevrolet Avalanche 2500, 2004-2005 Silverado 2500 HD, and 2004-2005 GMC Sierra 2500 HD, specifically for the 8.1L engine. This header replaces your factory exhaust manifolds to help your engine breathe more freely, which can lead to improved horsepower and torque, especially at lower and mid-range highway speeds. It also helps keep engine temperatures cooler during operation.

Gibson builds these headers with thick, 3/8 inch laser-cut port flanges that are designed to prevent warping and leaks, ensuring a solid seal. The tubing itself is made from durable 409L stainless steel and is mandrel-bent for smooth exhaust flow. Installation is straightforward as it uses OEM-style connections and requires no welding, making it a direct replacement for your stock manifolds. The kit comes complete with premium gaskets and all necessary hardware, so you have what you need to get the job done. These headers are street legal in all 50 states and meet EPA and CARB requirements, meaning they won't affect your factory warranty.

This header is a well-built option for owners looking to get more usable power from their 8.1L engine. It's suitable for both lowered and raised vehicles, whether you use your truck for street driving or off-road adventures. Gibson backs this header with a lifetime limited warranty, giving you confidence in its durability.