HIGH FLOW Exhaust Manifold & Up Pipes For 17-25 Chevy GMC 6.6 Duramax Diesel L5P

Introducing our High-Flow L5P Manifold & Up Pipe set. Tubular exhaust manifolds made from thick wall 304 stainless steel. The Doctor Diesel USA Up-Pipe bellows are internally sleeved, made from aircraft-grade 304 stainless steel, and designed with increased inner diameter for higher flow. The entire Manifold and Up-Pipe exhaust system are designed to maximize power and flow characteristics, lower exhaust gas temperatures (EGTs) and accelerate turbo spool-up while increasing power, fuel economy, and maintaining reliability.