iFJF 2017-2023 6.6L Chevy L5P Duramax Sierra/Silverado 3.5'' Downpipe & 3.5" High Flow Exhaust Up Pipes

Material: Stainless Steel Surface: Mirror Polish Downpipe:3.5" Stainless Steel Piping 20% better flow than the factory pipe 4-bolt flange, two studs installed Completely eliminates the DOC High-quality sealing ring to prevent oil leakage Quality tested for trouble-free performance 46% larger flow area over stock  Manufactured from 11 gauge 304 stainless steel  304 stainless steel, internally-sleeved bellows  Includes 301 stainless steel gaskets  Upgrade the L5P to achieve higher-flow by bolting on PPE OEM-Length Replacement High-Flow Up-Pipes. Fitment:2017-2023 Chevrolet Silverado & GMC Sierra 2500 & 3500HD 6.6L Duramax pickup trucks. Will not fit Cab & Chassis trucks.Feature:The inclusion of heat wrap helps to maintain lower engine bay temperatures, without affecting emissions systems. These direct fitment up-pipes require no modifications and have a 46% larger flow area than stock, resulting in improved engine performance while still meeting Federal emissions standards. The stainless steel construction and internally-sleeved bellows ensure durability and reliability under high temperatures and pressures, promoting increased exhaust flow and lower EGTs.