GM Duramax 6.6L Down-pipe (2001-2004)
Type: Down-Pipe | Fits: GM Duramax
Upgrade your 6.6L Duramax with this 3" stainless steel downpipe, designed to outperform the restrictive factory unit. With a 20% increase in exhaust flow, this downpipe reduces EGTs, improves turbo spool, and boosts efficiency—whether you’re towing, racing, or pushing your truck under heavy load.
Vehicle Compatibility
- 2001 Chevrolet Silverado/GMC Sierra 2500/3500HD 6.6L Duramax
- 2002 Chevrolet Silverado/GMC Sierra 2500/3500HD 6.6L Duramax
- 2003 Chevrolet Silverado/GMC Sierra 2500/3500HD 6.6L Duramax
- 2004 Chevrolet Silverado/GMC Sierra 2500/3500HD 6.6L Duramax
- Not compatible with Cab & Chassis models
Specifications
| Feature | Details |
|---|---|
| Material | 3" Stainless Steel Piping |
| Exhaust Flow | 20% increase over factory downpipe |
| Heat Management | Includes heat-wrap for reduced engine bay temperatures |
| Fitment | Direct turbo outlet fit with included gasket for secure installation |
| Applications | Daily driving, towing, heavy-duty hauling, or competition use |
| Emissions | Does not interfere with factory emissions systems |
Key Features
- 3" Stainless Steel Construction – Built tough for corrosion resistance and long service life.
- 20% Better Flow – Frees up turbo efficiency and horsepower compared to stock.
- Heat-Wrap Included – Keeps heat in the exhaust, lowering under-hood temps.
- Gasket Included – Ensures a secure, leak-free installation.
- Competition Ready – Ideal for towing, off-road use, and performance builds.
Performance Benefits
- Lower EGTs – Cooler exhaust temps keep your engine safer under load.
- Faster Turbo Response – Reduced restriction improves spool-up and throttle response.
- Durability & Reliability – Stainless steel build and heat retention provide long-lasting performance.
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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.
