PPE 116112500 High-Flow Exhaust Manifolds With Up-Pipes L5PThe PPE 116112500 High Flow Exhaust Manifolds With Up Pipes Kit are high flowing replacement manifolds for your 2017 2024 GM 6. 6L Duramax L5P. These manifolds are manufactures from a high sil moly casting for strength and durability. The aircraft grade 304 stainless steel up pipes feature bellows that are internally sleeved and made with an increased inner diameter for better flow. This manifold & up pipe kit is engineered to optimize horsepower and