PPE 116111420 High Flow Exhaust Manifolds and Up-Pipes Kits Black | 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 is constructed of heavy-duty cast, high-sil moly the Up-Pipes is constructed of heavy-duty aircraft-grade 304 stainless steel. Finished with a durable black ceramic coating to enable maximum power and flow characteristics. The Cermaic coating creates a thermal barrier without absorbing heat as quickly as raw metal. The ceramic coating also creates greater flow for a decrease in EGTs. The ceramic coating also protects against moisture, road salts, oil fuel and other corrosive chemicals, ensuring your PPE Manifolds look their best for a long time. Fits: 2004.5-2005 GM 6.6L Duramax [Installation Instructions]