PPE High-Flow Exhaust Manifold & Up-Pipe Kit - Black Ceramic Coating (2004.5-2005 GM 6.6L Duramax LLY) - (116111420
Overview
The factory exhaust manifold and up-pipe system on the 2004.5-2005 GM 6.6L Duramax LLY is known for creating excess back-pressure and elevated EGTs. PPE's High-Flow Exhaust Manifold and Up-Pipe Kit with Black Ceramic Coating replaces these restrictive factory components with a stronger, higher-flowing setup designed to improve turbo response, reduce heat, and support increased performance demands.
High-Flow Manifold Construction
The manifold is cast from high-sil moly iron for excellent durability and heat resistance. Its revised internal geometry promotes smoother exhaust flow, helping lower EGTs and improving turbo spool-up. The black ceramic coating adds an additional thermal barrier, reducing surface temperatures and offering long-term protection against corrosion, chemicals, and harsh conditions.
Free-Flow Up-Pipe Design
The included up-pipes feature free-flowing stainless steel inner liner bellows and are constructed 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 ceramic coating further enhances heat management, resulting in 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 manifold with black ceramic coating
- 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: 840171221565
Why Ceramic Coating Matters
Ceramic coating creates 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 and sharp 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)
CA Residents: WARNING: Cancer and Reproductive Harm www.P65Warnings.ca.gov
