PPE High-Flow Exhaust Manifold & Up-Pipe Kit - Raw Finish (2004.5-2005 GM 6.6L Duramax LLY) - (116111400
Overview
The factory exhaust manifold and up-pipe setup on the 2004.5-2005 GM 6.6L Duramax LLY is known for creating unnecessary back-pressure and elevated EGTs. PPE's High-Flow Exhaust Manifold and Up-Pipe Kit replaces these restrictive components with a stronger, smoother-flowing system designed to improve turbo response, reduce heat, and support higher performance demands.
High-Flow Manifold Construction
The manifold is cast from high-sil moly iron for excellent strength and heat resistance. Its optimized internal design promotes better exhaust flow, helping lower EGTs and improving turbo spool-up. A ceramic-coated version is also available for those who want enhanced thermal control and long-term corrosion protection.
Free-Flow Up-Pipe Design
The included up-pipes feature free-flowing stainless steel inner liner bellows and are built from 11-gauge (.120-inch wall) stainless steel with a 2-inch outside diameter. Internally sleeved bellows made from aircraft-grade 304 stainless steel increase durability and flow capacity under high heat and high boost conditions.
Performance & Reliability Benefits
Together, the manifold and up-pipe system is engineered to maximize exhaust flow, reduce thermal load, and improve overall engine efficiency. The result is quicker turbo spool, lower EGTs, and more consistent performance whether towing, daily driving, or running performance upgrades.
Key Features
- Significant reduction in exhaust back-pressure
- High-sil moly cast iron high-flow manifold
- Free-flow stainless steel inner liner bellows
- 11-gauge stainless steel up-pipes with 2" OD
- Built-in bosses pre-drilled and tapped 1/8" NPT for EGT sensors
- High-temp coated exhaust manifold gaskets included
- Upper and lower up-pipe gaskets included
- Includes manifold bolts, studs, and spacers
- GTIN: 840171208931
Optional Ceramic Coating
PPE's ceramic coating option adds a thermal barrier that slows heat absorption and reduces surface temperatures. This improves flow efficiency, lowers EGTs even further, and protects the manifold from moisture, road salts, oil, fuel, and other corrosive elements. It also keeps the manifold looking clean for years.
Upgrade Path
Pair this kit with a PPE 3-inch 304 stainless steel downpipe for a complete high-flow exhaust solution. For maximum performance, combine with PPE's ceramic-coated manifold option and additional 304 stainless components.
Application
- 2005 GMC Sierra 3500HD 6.6L V8 Turbo Diesel (Duramax)
- 2005 GMC Sierra 2500HD 6.6L V8 Turbo Diesel (Duramax)
- 2005 Chevrolet Silverado 3500HD 6.6L V8 Turbo Diesel (Duramax)
- 2005 Chevrolet Silverado 2500HD 6.6L V8 Turbo Diesel (Duramax)
- 2004 GMC Sierra 3500HD LLY 6.6L V8 Turbo Diesel (Duramax)
- 2004 GMC Sierra 2500HD LLY 6.6L V8 Turbo Diesel (Duramax)
- 2004 GMC Sierra 2500HD 6.6L V8 Turbo Diesel (Duramax)
- 2004 Chevrolet Silverado 3500HD LLY 6.6L V8 Turbo Diesel (Duramax)
- 2004 Chevrolet Silverado 2500HD LLY 6.6L V8 Turbo Diesel (Duramax)
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