L5P Up Pipe | 6.6L Duramax | GMC/Chevy 2017-2024

Overview The L5P high-flow up-pipes are a direct replacement for the restrictive factory units, designed to increase exhaust flow and reduce back pressure on 2017-2024 6.6L Duramax engines. Built from heavy-gauge stainless steel with a larger internal diameter, they support improved exhaust velocity and lower EGTs while retaining emissions-compliant operation. Compatibility Years: 2017-2024 Makes: Chevrolet, GMC Models: Silverado 2500HD / 3500HD, Sierra 2500HD / 3500HD Engine: 6.6L Duramax L5P Diesel Technical Specifications Specification Detail Material 11-gauge 304 stainless steel Flow Increase 46% larger flow area vs OEM Bellows Type Internally-sleeved 304 stainless steel Gaskets Included 301 stainless steel gaskets Fitment Type OEM-length direct replacement Key Features & Build Details 46% Increased Flow Area - Larger internal diameter reduces restriction compared to factory up-pipes, improving exhaust gas movement. 11-Gauge 304 Stainless Construction - Thick-wall stainless steel resists cracking, corrosion and heat fatigue under sustained load. Internally-Sleeved Bellows - Reinforced bellows design adds durability by preventing over-expansion and premature failure common in…