PPE 116111435 High Flow Exhaust Manifolds and Up-Pipes Kits Silver | 2004.5-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LLY

Features: - Significant reduction in exhaust back-pressure - Cast hi-sil moly iron high-flow manifold construction - Up-Pipes have free-flowing stainless steel inner liner bellows - Up-Pipes made from stainless steel 11-gauge .120-inch wall, with a 2-inch outside diameter - Built in bosses, pre-drilled and tapped 1/8” NPT for EGT gauge sensor - 3 year limited warranty High Flow Design with Maximum Power PPE's High-Flow Manifolds are 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 and accelerate turbo spool-up while increasing power, fuel economy, and maintaining reliability. Heavy Duty and Ceramic Coated PPE's High-Flow Manifolds are made from heavy-duty cast high-sil moly, while the Up-Pipes are crafted from robust aircraft-grade 304 stainless steel. Both are finished with a durable silver ceramic coating to maximize power and flow characteristics. This ceramic coating acts as a thermal barrier, reducing heat absorption compared to raw metal. It also enhances flow, lowering EGTs (exhaust gas temperatures). Additionally, the ceramic coating protects against moisture, road salts, oil, fuel, and other corrosive chemicals, ensuring your PPE Manifolds maintain their appearance and performance for a long time. Fits: 2004.5-2005 GM 6.6L Duramax [Installation Instructions]