The PPE 116111400 High-Flow Exhaust Manifolds with Up-Pipes for your 04.5-05 GM 6.6L Duramax LLY 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.
- CARB E.O. D-701-1
- 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
2004.5-2005 GM 6.6L Duramax LLY (Federal Emissions)