01-04 Duramax PPE Manifolds & Up Pipes

PPE’s High-Flow Exhaust Manifolds and Up-Pipes have a 53% greater flow over stock, NO EGR PROVISION  PPE Manifolds are made from high-quality cast iron and the Up Pipes are made from 11 gauge 304 stainless steel. The aircraft grade 304 stainless steel Up-Pipe bellows are high-flow, internally sleeved, and have an increased inner diameter.   Features: ▪ Cast Hi-Sil Moly iron high-flow manifold construction ▪ Significant reduction in exhaust back pressure ▪ Free-flowing stainless steel inner liner bellows ▪ Stainless steel 11-gauge .120-inch wall diameter Up-Pipes ▪ Built in bosses, pre-drilled and tapped 1/8" NPT for EGT gauge