BD Diesel Exhaust Manifolds for Chevy Duramax 6.6L LB7 2001-2004

BD Diesel Exhaust Manifolds for Chevy Duramax 6.6L LB7 (2001–2004) Upgrade your Duramax with BD Diesel exhaust manifolds engineered for the 6.6L LB7 (2001–2004). Designed to deliver improved flow, durability, and fitment, these manifolds are a direct replacement for worn or cracked factory units. Precision fit: Direct bolt-on design for 2001–2004 Chevy/GMC Duramax 6.6L LB7 engines — no modification required. Improved exhaust flow: Optimized runner geometry reduces backpressure for better turbo responsiveness and consistency under load. Durable construction: Built from high-grade cast iron with reinforced flanges to resist cracking and warping in high-heat applications. OEM-style mounting: Correct port alignment and hardware compatibility ensure easy installation and reliable sealing. Performance benefits: Helps maintain turbocharger health, supports exhaust system efficiency, and can contribute to smoother idle and quicker spool. Ideal for owners restoring performance and reliability to LB7 trucks. Backed by BD Diesel quality control and engineered specifically for the Duramax platform.