GM Duramax 6.6L Exhaust Manifold Kit w/ Up-Pipe (2001-2016)
Type: Exhaust Manifold Kit | Fits: GM Duramax
The Duramax Exhaust Manifold Kit is built for 2001–2016 Duramax 6.6L engines and delivers significant gains in airflow, turbo efficiency, and throttle response. With cast iron manifolds for strength and stainless-steel up-pipes for durability, this upgrade is engineered to outlast stock components while unlocking hidden performance. Perfect for off-road and competition use.
Vehicle Fitment
- ✅ 2001–2016 GMC Sierra 2500HD/3500HD 6.6L Duramax
- ✅ 2001–2016 Chevrolet Silverado 2500HD/3500HD 6.6L Duramax
⚠️ Notes
- Designed for non-EGR setups. The EGR system must be removed on LB7 and LLY–LML engines.
- 2015+ models may require shock mount modification.
What’s Included
- Cast iron exhaust manifolds
- Stainless steel up-pipes
- Pre-drilled & tapped 1/8" NPT bungs for EGR sensors
- Full hardware kit
Key Features
- Higher Flow Rate vs. OEM: Increases airflow efficiency for more power.
- Improved Turbo Efficiency: Reduces restriction and enhances spool-up.
- Better Throttle Response: Delivers quicker, sharper acceleration.
- Cast Iron Manifolds: Built for maximum durability and heat resistance.
- Stainless Steel Up-Pipes: Strong, long-lasting design that resists corrosion.
- Optimized Flow & Reduced Turbulence: Keeps exhaust temps lower while maximizing performance.
Benefits
- Unlocks horsepower and torque gains through improved exhaust flow.
- Helps reduce turbo lag with smoother, more efficient airflow.
- Outlasts OEM manifolds with stronger materials and construction.
- Designed to support stock or tuned Duramax builds.
Installation
This is a direct-fit upgrade, though modifications may be required depending on the model year. All hardware is included for a secure installation. While experienced DIY mechanics may install this kit at home, professional installation is strongly recommended to ensure proper fitment and performance.
Important Notes:
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Important Notices
- Off‑Road Use Only
Products sold by JS Speed are intended for off‑road use and may be illegal on public roads where emissions or pollution‑control laws apply. - Check Local Laws
Before purchasing or installing, verify all applicable local, state/provincial, and federal regulations to ensure the modification is legal in your area. - Professional Installation Recommended
These parts should be installed by qualified professional mechanics. Improper installation can cause performance issues or vehicle damage. Unless a product page explicitly states otherwise, installation instructions are not included. Components are designed for users with solid mechanical knowledge, and minor adjustments or modifications may be required for proper fitment. Returns or refunds cannot be accepted due to difficulty completing an installation or the absence of instructions. - Warranty Impact
Use of these parts may void your vehicle’s factory warranty. Confirm with your vehicle manufacturer before purchase and installation. - Limitation of Liability
JS Speed is not responsible for damage, failures, or issues arising from the use or installation of these products. - Product Images
Images are for illustration only and may differ from the actual product due to manufacturer updates or improvements. - No Performance Guarantees
While these products are designed to enhance performance, JS Speed does not guarantee specific performance results.
