Doug's Headers Full-Length Exhaust Headers

The Doug's Headers D322-B is a high-performance, full-length exhaust header system engineered to deliver substantial gains in horsepower and torque across the entire RPM range, making it a choice for enthusiasts seeking maximum power. Constructed from durable 16-gauge steel, these headers feature 2-inch primary tubes that transition to 3.5-inch collector ports. The tubing is CNC mandrel-bent for an accurate fit and optimal exhaust flow. Each header is finished with a Hi-Temp Black Coating, providing a matte black appearance that offers resistance to rust and corrosion under demanding conditions. Designed for a performance upgrade, these headers incorporate 3/8-inch thick machined flanges to ensure they remain warp-free. The package includes necessary gaskets and mounting hardware to facilitate installation. For specific vehicle fitment, this header is designed for 1965-1986 Chevrolet/GMC Big Block vehicles *without* air conditioning. When installing these headers, note that specific vehicle applications may require big block frame stands and motor mounts for proper fitment. Additionally, some applications, such as those with a Powerglide transmission, are not compatible. The product is also identified with emissions compliance information, noting it is legal for use on Pre-Pollution Controlled Vehicles and for competition use only, or legal for street use in 49 states but not California unless it has a CARB Executive Order (EO) exemption for the specific vehicle application.