The PPE 116111000 High-Flow Exhaust Manifolds with Up-Pipes for your 01-04 GM 6.6L Duramax LB7 increase exhaust flow by 20 percent and are 50 state emissions legal. Designed to outlast your truck the manifolds are made from high-quality cast iron and the up pipes are made from stainless steel. Plus the aircraft grade Up-Pipe bellows are high-flow, internally sleeved, and have an increased inner diameter.
The PPE 116120000 Replacement Up-Pipes for your GM 6.6L Duramax increase flow, and reliability. Even a stock Duramax can produce high temperatures and pressures that cause OEM up pipes eventually fail from constant temperature and pressure fluctuation.
If one thing is for certain it’s that the Ford 6.0L factory Y-Pipe will fail at some point during the vehicle’s service. Well have we got good news for you, Smashed Performance now has a solution to replace that factory part with a much more reliable direct replacement version that will last for years to come.